Imed Ahmed Sassi From my understanding, the software is not free, although there may be a trial version. From the COMSOL site: 'You will need an on-subscription COMSOL license attached to your COMSOL Access account or a software trial provided by your sales representative. Trial licenses are automatically associated with your account' and 'To use this license a class list must be provided by the faculty teaching the class, preferably before the start of a semester. The cost of the licenses (about $4500 per year) is shared by the departments requesting access. Feb 1, 2012'

Free trial: https://technic.com.au/free-trial/#:~:text=Get%20your%20free%20no%2Dobligation,the%20form%20on%20this%20page.