I misread your original post, thought you already had forscan and the license expired.
You can go to the forscan.org page and download forscan for windows, then pick the 2 month free trial to get the license.
You'll also need an OBD2 interface for the PC.
Forscan is a little intimidating at first, you can search this forum or Youtube videos on how to use it. The Forscan webpage itself has a lot of information.