Since you cannot download a native PC version, you have three legitimate paths: 1. Xbox Console (Best Experience)

If you own an Xbox One, Xbox Series X, or Xbox Series S, you can play the game via backward compatibility. However, the game was from the Microsoft Store in 2018 due to expiring car and music licenses [6]. To play it now, you must: Find a physical disc (Xbox One or Xbox 360 version).

Technically, advanced users use the to run the Xbox 360 version of Forza Horizon 2 on PC.

The "verified" installer often contains adware or trojans.