There is no legal "free" version of 3.5a, except for the COMSOL Demo (which expired after 30 days or stopped saving files). All other "free downloads" are pirated software. The Hidden Dangers of "Cracked" Software When you download a cracked version of Comsol 3.5a from a random website, you are not just stealing software; you are inviting disaster.
COMSOL AB actively monitors torrent swarms. In the US and EU, using pirated engineering software on a company computer can result in fines exceeding $150,000 per instance. Even for students, universities share DMCA notices with internet providers. Comsol Multiphysics 3.5a Free Download
The entire point of Comsol is to simulate reality. If you use a cracked version, the solver may be intentionally corrupted by the cracker (or fail silently). You cannot trust a single result from a pirated simulation. If you publish a paper or design a bridge based on pirate software, you are risking lives and careers. There is no legal "free" version of 3
If something is "free" on an obscure file-sharing forum, you are not the customer— you are the product. Have you used Comsol 3.5a in the past? Do you have a legitimate license file but lost the CD? Contact COMSOL technical support directly; they are surprisingly helpful to verified legacy customers. COMSOL AB actively monitors torrent swarms