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It can be useful for you to link your license number to your COMSOL Access Account. This will allow you to, in the future, gain access to product updates and the support knowledge base, you need to provide your trial number or license number. You can do this by submitting your license.dat file that you find here:
where [COMSOL] is the COMSOL Multiphysics installation directory. This is typically /usr/local/comsolXX on Linux, and C:\Program Files\COMSOL\COMSOLXX on Windows.
You can also add a license by entering your passcode. Passcodes are often given out for trials.
A passcode looks like this: XXXXXXXXXX-XXXX-XXXXXX-XXXXXXX-XXXXXXXXX.