You can learn modeling and simulation for free of charge.The license is renewable. Please note that there are limitations on functions as below.
As there are no limitations on reading projects and results, you can use it as viewer.
There will be no user support for the Free with Limited Functions.
See here for system requirements of the Free with Limited Functions.
Fill in the application form.
Once your application is processed, you will receive an email with URL for downloading an installer.