If your university is already registered with Optum all you have to to is:

1. Create an account using the button below.
2. Sign in to activate your academic license and download the software.
3. Renewe your license every 3 months through your Optum account.

You can check your university domain here.

The free academic software packages have full functionality except with a restriction on number of materials used in a single model. Versions with full functionality can be acquired for very affordable academic prices.