Instead of chasing an outdated, dangerous version, leverage COMSOL’s legitimate free offerings. You can get the power of COMSOL Multiphysics 6.2 (the latest as of this writing) for free under specific conditions.
Version 3.5a of COMSOL Multiphysics was released in late 2008. While it introduced valuable features including improved CAD import capabilities, enhanced solvers, and a more streamlined user interface, it is now considered obsolete. The current version (COMSOL 6.x, as of 2025) offers significantly improved performance, a broader physics library, and live interface links with MATLAB and CAD software. Using an outdated version like 3.5a would not only deprive users of modern capabilities but also lack support for contemporary operating systems and hardware.
If you absolutely need version 3.5a because you have old models that won't migrate to version 6.x, here is the legal process: comsol multiphysics 35a free new download
Important: There is no "free" version of 3.5a. If you find an ISO file online, it is either fake or stolen.
Go to www.comsol.com and navigate to "Downloads" -> "Free Trial." Contact COMSOL Support: If you have an active
Q: Is COMSOL 3.5a freeware now? A: No. COMSOL has never released any version as freeware. Version 3.5a requires a paid license, though it is rarely sold new today.
Q: Can I use COMSOL forever if I don't connect to the internet? A: For the trial, no. The license file has a hard expiration date. For student versions, they expire after 6-12 months. Important: There is no "free" version of 3
Q: What is the best alternative if I really need free software? A: Look into OpenFOAM (CFD), Elmer FEM (multiphysics), or FreeCAD (structural). These are open-source and truly free, though they lack COMSOL's GUI polish.
Q: Why does my university use COMSOL 3.5a still? A: Some professors have legacy courses with old tutorials. However, most have migrated. If your lab still uses 3.5a, they likely own a permanent license (perpetual license) purchased before 2011.