Version 6.0 includes significant updates aimed at increasing productivity: COMSOL Client 6.4 for Windows®
COMSOL doesn't offer a standard "freeware" version, but you can access it through these official channels: comsol multiphysics 6.0 free download
A "free download" for is only legally possible through official channels, typically requiring a valid license or an authorized trial passcode . COMSOL does not offer a permanently free version of its core software. How to Legally Access COMSOL 6.0 Version 6