There is no legal "free new download" for version 35a (or any recent version) outside of:

Downloading software from unauthorized, "free" sources can expose your computer to malware and viruses. Always use official or reputable sources.

Searching for "free new download" links for software like COMSOL often leads to third-party sites offering pirated, cracked, or torrented versions. Using these methods carries significant risks:

If you are a student or educator, you likely qualify for a free semester-long license.

If you find a website offering a "free new download" of version 3.5a today, you should proceed with extreme caution for a few reasons:

Below is what you can expect to find regarding version 3.5a, including its documentation and the official channels for using the current software. All direct software installation for older versions requires a valid license file for that version from COMSOL, which you can contact their sales team about if you have legacy needs.

If you have a valid license file for an older version (e.g., 3.5a from ~2009), you may download installers from your COMSOL account. Unlicensed use is still prohibited.