Eset Offline Update ~upd~ -

Reviewing ESET's Offline Update capabilities reveals a system designed primarily for high-security, air-gapped environments or networks with limited bandwidth. Unlike some consumer antiviruses that only offer online live installers, ESET provides robust infrastructure for "Update Mirrors" and "Mirror Tools" to keep disconnected systems secure. Core Functionality & Mechanics

The ESET offline update system operates through a Mirror architecture rather than simple individual file downloads.

Mirror Tool: This is a standalone utility used to download the latest detection engine updates and application modules from ESET's servers to a local folder.

Update Mirror: In business environments, a computer with internet access acts as a "Mirror Server". It hosts the update files, which other computers on the local network (LAN) then pull from, either via an HTTP server or a shared network folder (SMB).

Policy-Based Updates: For managed environments using ESET PROTECT, you can push policies to offline clients that point them to the local Mirror IP address instead of ESET's official update servers. Key Advantages

Bandwidth Efficiency: Updates are downloaded once from the internet and distributed locally, which is vital for remote sites with poor connectivity.

Security for Air-Gapped Systems: It allows systems that cannot touch the internet (due to regulatory or security reasons) to receive daily threat definitions.

Comprehensive Coverage: It updates not just the virus signatures but also program modules like the firewall and HIPS (Host Intrusion Prevention System). Drawbacks & Limitations

For ESET products in environments without internet access, updates are typically managed through a local update mirror offline repository

. This allows one machine with internet access to download the necessary modules and distribute them to others in a closed network. 1. Create a Local Update Mirror

If you have at least one computer with internet access, you can configure it as a "mirror" to serve updates to others. ESET Knowledgebase Enable Mirroring ESET application for Advanced Setup. Go to Update Mirror . Toggle on Create update mirror Storage Folder Storage folder to set where the update files will be saved. HTTP Server Enable HTTP Server

is active so other computers can reach this machine via its IP address (e.g.,

For environments where computers are not connected to the internet, ESET provides several ways to keep security modules up-to-date. This is primarily a feature for ESET Endpoint business products. 🛠️ Common Methods for Offline Updates

Mirror Tool: Use the ESET Mirror tool on a machine with internet access to download all necessary updates. These files can then be transferred via a USB drive or network share to the offline machines.

Update Mirror (Internal Server): You can configure an ESET product on a networked (but isolated) machine to act as a local update mirror. It downloads updates once and serves them to other clients on the local network via HTTP or a shared folder.

Offline Repository: For environments managed by ESET PROTECT, you can set up an offline repository address in the policy settings to direct clients to a local source for both module and product updates. 📝 Step-by-Step Configuration (Standalone Client)

To manually update a standalone machine from a local folder:

In high-security environments, such as government agencies or air-gapped corporate networks, keeping security software current without a direct internet connection is a critical challenge. The ESET offline update process solves this by allowing machines to receive detection engine and module updates via a local mirror or removable media. Why Use ESET Offline Updates?

Air-Gapped Systems: Protects critical infrastructure that must remain disconnected from the public internet.

Bandwidth Conservation: Reduces external network traffic by downloading updates once to a central "mirror" server instead of each client downloading them individually.

Compliance: Meets strict regulatory requirements for closed-network security. Step 1: Prepare the Mirror Tool

The ESET Mirror Tool is a standalone utility that creates a local repository of update files.

Download the Tool: Obtain the MirrorTool.exe from the ESET Standalone Installers page on a machine with internet access.

Get an Offline License: Log in to ESET Business Account or ESET PROTECT Hub to generate and download an offline activation file (.lf). This is mandatory for the Mirror Tool to authorize downloads.

Run the Initial Download: Use the Command Prompt to trigger the download. A typical command looks like this:

MirrorTool.exe --mirrorType regular --offlineLicenseFilename c:\mirror\offline.lf --outputDirectory C:\mirror\out Use code with caution.

This creates a structured update repository in your output folder. Step 2: Distribute Updates to Offline Clients

Once you have the repository, you can deliver it to offline machines using two primary methods: Method A: Removable Media (USB/CD)

For completely isolated machines, manually transfer the repository. Mirror Tool - Windows | ESET PROTECT On-Prem 12.0

ESET offline updates allow computers in closed environments or with restricted internet access to maintain protection by downloading module and application updates from a local "mirror" rather than directly from ESET servers. This process typically involves a machine with internet access using the ESET Mirror Tool to create a repository of updates, which is then served to offline clients via an internal HTTP server or a shared network folder. Offline Update Infrastructure

For environments without internet connectivity, ESET provides several ways to distribute updates locally:

Mirror Tool: This is the primary method for creating an offline repository. It downloads all necessary update modules and metadata from ESET servers to a local directory. Update Mirror (HTTP Server) : An ESET product (like ESET Endpoint

) can be configured as a mirror to share updates with other computers in the same network.

ESET Bridge (Proxy): If at least one computer has internet access, ESET Bridge can cache update files locally, significantly reducing external traffic by downloading files once and serving them to all other clients. Configuration Steps 1. Setting up the Local Mirror On the computer that will serve as the update source: Open the ESET program and press F5 for Advanced Setup. Navigate to Update → Profiles → Update Mirror. Enable the Create update mirror toggle. Specify a Storage folder path where updates will be saved.

Enable HTTP Server and, if needed, set a username, password, or custom port. 2. Configuring Offline Clients To direct client machines to the local mirror: Open Advanced Setup (F5) on the client machine. Go to Update → Profiles → Updates. Disable Choose automatically under Module Updates.

In the Custom server field, enter the IP address of your mirror (e.g., http://10.20.30.50:2221). Key Considerations

License Files: Managing updates in a completely offline environment requires an offline license file (.lf), which can be generated through the ESET Business Account or ESET PROTECT.

Product Types: Offline updates are generally a feature of ESET business/endpoint products. Most home products, like ESET NOD32 Antivirus, do not support offline updating.

Maintenance: Regularly clear the Update Cache if you encounter errors. This is done via Advanced Setup → Update → Clear update cache. Available Tools & Documentation Mirror Tool Create offline repositories for updates ESET Mirror Tool Guide ESET PROTECT Remote management for offline policies ESET PROTECT Online Help Advanced Setup Manual configuration on single devices ESET Endpoint Security Help

If you'd like, I can help you troubleshoot a specific update error or provide a step-by-step setup for a specific ESET version.

An ESET offline update is a manual method used to update ESET antivirus signature databases on computers that lack a direct internet connection. This procedure is essential for maintaining robust security in high-protection environments where systems must remain isolated from the outside world. By utilizing this approach, administrators can ensure that air-gapped machines receive the latest threat definitions without exposing them to the risks associated with live web access.

The primary benefit of offline updates is the preservation of strict security protocols, such as those found in government facilities, research laboratories, or financial institutions. In these settings, connecting a workstation to the internet introduces potential vectors for malware, data leaks, and unauthorized access. The offline update mechanism allows these secure systems to remain entirely disconnected while still benefiting from the continuous research and database expansions provided by ESET laboratories. eset offline update

Implementing an ESET offline update typically involves a two-step procedure centered around a mirror server or an intermediary machine. First, an administrator uses a computer with active internet access to download the latest virus signature database files directly from ESET servers. These files are then transferred to a portable storage device, such as a secure USB drive. Finally, the administrator physically moves the storage device to the isolated machine and configures the ESET software to pull its updates from the local directory instead of the default online servers.

While highly effective for security, this method does present distinct operational challenges. The most significant drawback is the administrative overhead, as it requires manual intervention every time an update is needed. Because modern cyber threats evolve rapidly, sometimes hourly, infrequent manual updates can leave isolated systems temporarily vulnerable to brand-new malware strains. Consequently, administrators must establish strict, frequent routines for transferring these files to maintain an acceptable security posture.

In conclusion, ESET offline updates serve as a vital bridge between absolute network isolation and modern cybersecurity needs. They allow organizations to maintain the integrity of air-gapped networks without sacrificing the protective intelligence of up-to-date antivirus software. While the process demands consistent manual effort and meticulous scheduling, it remains an indispensable strategy for safeguarding the world's most sensitive digital environments.

To perform an ESET offline update , you typically use the Mirror Tool

to create a local update repository on a machine with internet access, which can then be transferred to an offline network via an external drive or local network share. Core Offline Update Methods Mirror Tool (Recommended for Networks):

A standalone utility that downloads ESET update modules to a local folder. You can then share this folder via an HTTP server or a network path (UNC) for other client machines to use. Offline Mirror Feature:

Certain ESET endpoint products can be configured to act as a "mirror server" themselves. You enable this in Advanced Setup (F5) > Update > Profiles > Update Mirror Manual Folder Import:

For individual legacy or standalone machines, you can copy the update files (often

files) from an updated machine's cache and point the offline machine's update path to that local folder. Step-by-Step: Setting Up an Offline Update Mirror Download the Mirror Tool : Obtain the tool from the ESET official download page Generate an Offline License : Log in to the ESET Business Account ESET PROTECT Hub and create an offline license file ). This file is required to authorize the Mirror Tool. Run the Tool : Use the command line to start the download.

MirrorTool.exe --mirrorType regular --offlineLicenseFilename c:\mirror\offline.lf --outputDirectory C:\mirror\out Configure Clients : On the offline machine, open ESET and press Advanced Setup Navigate to Update > Profiles > Updates Choose automatically and enter the local folder path or local server IP (e.g.,

Title: The Last Signature Setting: Sector 4 (The "Gray Zone"), 30 clicks from the Detroit Sprawl. Protagonist: Kael, a data-scavenger running a legacy security rig.

The air inside the cockpit of The Dredger smelled like ozone and stale recycled coffee. Outside, the acid rain drummed a relentless rhythm against the polarized glass, blurring the neon bleed of the distant city into watercolor smears.

Kael ignored the view. His eyes were locked on the holo-screen projected from his dashboard. A single, blinking amber light.

SYSTEM STATUS: THREAT DETECTED. ENGINE VERSION: 4.2.1 (OBSOLETE). MODULE: ESET Cyber Security - HEURISTIC ANALYSIS: FAILED.

"C'mon, you piece of antique junk," Kael whispered, tapping the manual override. "Don't do this to me now."

He was hauling a sealed server rack he’d dug out of a sunken corporate bunker—a score big enough to buy him six months of clean water and real meat. But the rack was air-gapped, paranoid, and protected by a dormant, mutated strain of polymorphic malware. To access the data without triggering the wipe protocol, he needed to run a security scan. But his rig was too old. The definitions were months out of date.

The connection to the global grid had been spotty for weeks. The Corporations were fighting again, jamming the frequencies. Kael didn't have the bandwidth to download a 400-megabyte update package over the air.

He needed to go offline.

"Initiating ESET Offline Update protocol," Kael muttered, reaching under his seat for the heavy, ruggedized drive he kept there.

It was an archaic method, something the old-school runners called "Sneakernet." In a world of cloud-syncing neural links, carrying data physically was considered barbaric. But barbaric was reliable.

He slotted the drive. The system chirped.

SOURCE: EXTERNAL. INITIALIZING... LOADING UPDATE FILE: NOD32_V92.0.12.SIG

The progress bar crept forward. Ten percent. Twenty.

The lights in the cockpit flickered. The server rack behind him let out a low, mechanical whine. The malware inside was sensing the intrusion. It was waking up.

"Easy, boy," Kael said, his hand hovering over the emergency eject button. If the scan failed, the malware would bridge the connection and fry his ship’s nav-system. He’d be dead in the water, waiting for the scavengers to pick his bones.

ERROR. VERIFICATION FAILED.

Kael froze. "What?"

The screen flashed red. SIGNATURE FILE CORRUPTED. INTEGRITY CHECK: FAIL.

He ripped the drive out and stared at it. The casing was cracked. Moisture from the humid air must have seeped in. He had a dead file, and a waking monster.

The server rack began to click rapidly. The cooling fans screamed. The malware was executing a counter-offensive. A warning siren blared in the cockpit.

BREACH IMMINENT. NETWORK INTRUSION DETECTED.

Kael slammed his fist against the console. He was out of time. He couldn't download the update, and his local file was trash. He was about to lose everything.

Then, he saw it. A tiny, flickering icon in the corner of his HUD. The Local Cache.

ESET’s architecture had a failsafe for just this kind of hell. Even if the primary update file was corrupted, the engine maintained a shadow copy of the last known good configuration in the system kernel, isolated from the main drive. It wasn't the newest update. It wasn't the version 92 he was trying to load. It was version 88. Ancient history.

But it was clean.

"System," Kael barked. "Rollback. Load offline repository. Version 88."

WARNING: LEGACY ENGINE MAY NOT DETECT ZERO-DAY THREATS.

"It's not a zero-day if it's a twenty-year-old bunker virus!" Kael shouted. "Execute!"

The drive whirred. The progress bar didn't creep this time; it slammed forward.

LOADING OFFLINE REPOSITORY... APPLYING SIGNATURES... ARCHIVE PROCESSING: 100%.

The cabin went silent. The server rack’s screaming fans died down to a low hum. The red warning lights dissolved into a soothing, reassuring blue. Best for: ESET NOD32 Antivirus, ESET Smart Security

THREAT NEUTRALIZED. QUARANTINE INITIATED. FILES SECURE.

Kael slumped back in his pilot’s chair, exhaling a breath he felt he’d been holding for an hour. He looked at the screen. The data on the server rack was decrypting. It was safe.

He patted the dashboard of the old ship. Sometimes, the cloud let you down. Sometimes the grid failed you. But a good offline update, stored deep in the local memory, was like a loaded gun in a knife fight.

"Legacy systems for the win," he smiled, engaging the thrusters to head back to the Sprawl.

UPDATE COMPLETE.

Type A: The "Offline Update File" (Via Direct Download)

This is the method for individual home users (ESET Smart Security / NOD32 Antivirus). ESET publishes a single, self-contained ZIP file containing the latest virus signature database (usually update.7z or eset_update.zip).

Example Use Case

A hospital’s radiology PC is not connected to the internet for security reasons. An IT admin downloads the offline update on a trusted online PC once a week, copies it to a USB drive, and updates the radiology PC manually.

Would you like step‑by‑step instructions for a specific ESET product or version?

Introduction

In today's connected world, cybersecurity is a top priority for individuals and organizations alike. ESET, a renowned cybersecurity company, offers a range of products and services to protect against various types of malware and online threats. One of the key features of ESET's products is the offline update capability, which allows users to update their ESET software even without an active internet connection. In this article, we'll explore the concept of ESET offline update, its benefits, and how to perform it.

What is ESET Offline Update?

ESET offline update is a feature that enables ESET users to update their software with the latest virus definitions and program updates without requiring an active internet connection. This feature is particularly useful for users who have limited or no internet access, or those who want to ensure their ESET software is up-to-date before connecting to the internet.

Benefits of ESET Offline Update

The ESET offline update feature offers several benefits, including:

  1. Improved security: By keeping your ESET software up-to-date, you ensure that your device is protected against the latest malware and threats, even if you don't have an active internet connection.
  2. Convenience: Offline updates allow you to update your ESET software at a time that's convenient for you, without having to worry about internet connectivity.
  3. Reduced bandwidth usage: Offline updates can help reduce bandwidth usage, which is particularly useful for users with limited internet plans or slow internet connections.

How to Perform ESET Offline Update

To perform an ESET offline update, you'll need to:

  1. Download the ESET update files: Go to the ESET website and download the latest update files for your ESET product. These files are usually in the form of a .upd or .txt file.
  2. Save the update files: Save the downloaded update files to a USB drive or a CD/DVD.
  3. Insert the update media: Insert the USB drive or CD/DVD containing the update files into the device with ESET software installed.
  4. Open ESET software: Open the ESET software and navigate to the update section.
  5. Select offline update: Select the option to perform an offline update and choose the update file from the USB drive or CD/DVD.
  6. Update ESET software: The ESET software will then update using the offline update files.

Best Practices for ESET Offline Update

To ensure a smooth and successful offline update, follow these best practices:

  1. Regularly download update files: Regularly download the latest update files from the ESET website to ensure you have the most up-to-date protection.
  2. Use a reliable storage device: Use a reliable storage device, such as a USB drive, to store the update files.
  3. Verify update files: Verify the integrity of the update files to ensure they haven't been corrupted during download.

Conclusion

In conclusion, ESET offline update is a valuable feature that allows users to keep their ESET software up-to-date even without an active internet connection. By understanding the benefits and process of offline updates, users can ensure their devices are protected against the latest threats and malware, while also enjoying the convenience and reduced bandwidth usage that offline updates offer.

Offline updates allow ESET products to stay current without an active internet connection on the target machine. This is typically achieved by downloading update files on an online computer and transferring them via removable media. 🛠️ How to Perform an ESET Offline Update

To update your ESET software manually, you need to configure the program to look for local files instead of ESET’s online servers. Step 1: Download Update Files

You must first obtain the offline update modules. These are often provided as a .zip or directory of files from the ESET Update Server or through an ESET Mirror. Step 2: Configure Advanced Setup

Open your ESET product and press F5 to enter Advanced Setup. Navigate to Update > Profiles > Updates. Locate the Update type or Update server setting.

Select Choose automatically or manually enter the path to the folder containing your offline update files (e.g., D:\ESET_Updates). Step 3: Trigger the Update Return to the main program window. Click Update in the left-hand menu.

Select Check for updates to begin the process from your local source. 💡 Key Benefits of Offline Updates

Air-Gapped Security: Keep high-security systems protected without exposing them to the internet.

Bandwidth Savings: Download updates once and distribute them to multiple machines on a local network.

Stable Environments: Use specific module versions that have been vetted for stability before deployment. ⚠️ Important Considerations

License Validity: Even for offline updates, your ESET product requires a valid license to function and process the modules.

File Freshness: Antivirus signatures become outdated quickly; ensure you download the latest offline files daily to maintain protection.

Feature Limits: Some cloud-based features, like ESET LiveGrid, may not function properly without an occasional internet handshake. Module update | ESET Server Security for Linux 11.0

ESET security products are designed to receive regular virus signature updates via the internet to protect against the latest threats. However, in high-security environments, air-gapped systems, or locations with limited connectivity, a traditional internet-based update is not possible. This is where an ESET offline update becomes essential. Understanding ESET Offline Updates

An offline update allows you to keep your ESET antivirus or endpoint security software current without a direct connection to ESET's update servers. This process involves downloading the necessary update files on a machine with internet access and then transferring them to the offline computer via a removable medium, such as a USB flash drive or an internal network share. Why Use Offline Updates?

Air-Gapped Systems: Protecting sensitive computers that are physically isolated from all networks.

Bandwidth Conservation: Updating multiple machines on a slow network by downloading the files only once.

Network Security: Minimizing the number of devices with outbound internet access.

Server Stability: Ensuring servers in restricted environments remain protected. How to Perform an ESET Offline Update

The process differs slightly depending on whether you are managing a single standalone machine or a large network via ESET PROTECT.

Method 1: Using the ESET Mirror Tool (Recommended for Businesses)

The Mirror Tool is the official utility for creating a local repository of update files. Example Use Case A hospital’s radiology PC is

Download the Tool: Obtain the ESET Mirror Tool from the ESET website on a computer with internet access.

Create a Folder: Create a destination folder for the update files (e.g., C:\ESET_Updates).

Run the Command: Execute the tool via Command Prompt. A typical command looks like:MirrorTool.exe --mirrorType regular --intermediateUpdateDirectory C:\temp --offlineLicenseFilename license.lf --outputDirectory C:\ESET_Updates

Transfer Files: Copy the contents of the output directory to your offline machine or a local server. Configure the Client: Open your ESET product. Press F5 for Advanced Setup. Navigate to Update > Profiles > Updates.

In the Update server field, enter the path to the folder (e.g., file:///C:/ESET_Updates). Method 2: Manual Update for Home Users

For individual users without access to the Mirror Tool, ESET provides offline update modules (legacy support varies by region and product version).

Download Update Files: Access the ESET offline update page to download the latest .zip archive of the detection engine.

Extract Files: Unzip the archive into a dedicated folder on the offline PC.

Update Path: In the ESET software settings, change the update server to point to the local folder path where you extracted the files.

Trigger Update: Click "Check for updates" in the main program window. Best Practices for Offline Maintenance

Maintaining security in an offline environment requires a disciplined routine.

Frequency: Aim to perform an offline update at least once every 24 to 48 hours to defend against zero-day threats.

License Management: Ensure you have an offline license file (.lf) exported from ESET Business Account, as the software cannot verify subscriptions online.

Automation: If the offline machine is on a private LAN, host the update files on a local HTTP server or shared drive to automate updates for multiple clients.

Validation: Always verify the "Last successful update" timestamp in the ESET GUI to ensure the local path is working correctly. Troubleshooting Common Issues

Modules Out of Date: Ensure you are downloading the full set of modules, not just the detection engine.

Invalid License: Offline updates usually require a specific offline license file to be uploaded during the Mirror Tool configuration.

Path Errors: When entering a local file path, use the format file:/// followed by the drive letter and folder.

By implementing a robust offline update strategy, you can enjoy the industry-leading protection of ESET even in the most restricted digital environments.

ESET offline update is a critical feature designed for computers or networks that do not have direct access to the internet. This "air-gapped" security method ensures that even isolated systems remain protected against the latest malware by manually transferring virus signature databases from an online machine. Why Use Offline Updates? High-Security Environments

: Ideal for government, military, or research labs where internet access is restricted to prevent data leaks. Bandwidth Conservation

: In locations with expensive or limited internet, one machine can download updates and distribute them locally. Unstable Connections

: Systems in remote areas can be updated via physical media (USB drives) when a stable web connection is unavailable. Methods for Offline Updating

Depending on your version and setup, ESET provides different tools to facilitate this: ESET Mirror Tool

: This is the official utility for creating an offline repository. It downloads detection engine updates and program modules from ESET servers and saves them to a local folder or shared network drive. Update Mirror Feature

: Some ESET Endpoint versions allow you to designate one computer as a "Mirror." This machine downloads updates and acts as a local server for other workstations in the same network. Offline License Files

: To enable these features, you typically need an offline license (.lf) file from the ESET Business Account

portal, which authorizes the software to update without contacting ESET's online activation servers. ESET Knowledgebase How to Set It Up (General Steps) Generate License : Log into your ESET account and download an offline license file Create Repository Mirror Tool

on a machine with internet access to download the update files to a USB or internal drive. Configure Client : On the offline computer, go to Advanced Setup (F5) Point to Source

: Set the "Update Server" or "Update Mirror" path to the folder where you stored the downloaded files. ESET Knowledgebase For detailed technical walkthroughs, the ESET Knowledgebase provides step-by-step guides for Endpoint versions Server products step-by-step guide

for a particular version of ESET, such as Endpoint Security or ESET PROTECT?

To perform an ESET offline update , you must configure a "mirror" server on a machine with internet access to download the latest detection modules, which can then be shared with offline clients via a local network or removable media. Phase 1: Create an Update Mirror (Online Machine)

The machine used to create the mirror must have an ESET business product (like ESET Endpoint Security) and a valid offline license file ( Enter Advanced Setup : Open your ESET product and press Enable Mirror Navigate to Update Mirror Create update mirror to enabled [10]. Set Storage Path Storage folder to choose where the update files will be saved [10]. Enable HTTP Server

: If you plan to distribute updates over a local network, enable the internal HTTP Server

under the Update Mirror settings to allow other machines to "pull" updates from this one [10]. Phase 2: Update Offline Clients

Once the mirror files are ready, you must point your offline machines to that mirror's location. Configure Update Server On the offline machine, open ESET and press Update server to the URL of your mirror (e.g.,

Here’s a balanced review of ESET Offline Update, a tool designed for users who can’t connect their ESET antivirus to the internet for regular updates.

4) Apply the Offline Update on the target machine

Option A — Use ESET Offline Update executable (if provided)

  1. Run the offline update executable as Administrator.
  2. Follow on-screen prompts; the updater will place files into the product’s update folder.
  3. When complete, open ESET product and trigger an update/check.

Option B — Manual file placement (if no installer)

  1. Stop the ESET service(s) if required (Windows: stop ESET service via Services.msc or from product UI if it provides a “Pause protection” option).
  2. Locate the product’s update folder:
    • Windows typical paths:
      • C:\ProgramData\ESET\ESET Security\Remote\ or
      • C:\ProgramData\ESET\ESET NOD32 Antivirus\ or
      • C:\ProgramData\ESET\RemoteAdministrator\ (varies by product)
    • Linux/macOS: product-specific paths; consult product docs.
  3. Copy the update files (.vdb, .nup, etc.) into the update folder, preserving filenames.
  4. Restart ESET service or re-enable protection.
  5. In the ESET UI, trigger “Update” → “Update now” to let the product process local files.

Notes:

Launch ESET command line updater with local folder

Start-Process -FilePath "C:\Program Files\ESET\ESET Security\ecls.exe" -ArgumentList "--update-force --update-url=$OfflinePath"

Q4: Is there a portable version of the ESET offline updater?

No. The updater tool itself must be installed. However, you can copy the generated output folder to any number of offline PCs without re-installing the tool each time.