If you decide to try the emulation route via Xenia, your PC will need significant power to handle the translation of console code:
Emulation: The most common way players attempt to run the game on PC today is through Xbox 360 emulators like Xenia. While the Xbox One version is visually superior, the 360 version is the only one currently showing progress in the emulation scene. This requires a powerful PC and a legal backup of your game disc. Forza Horizon 2 Pc Game Download
Xbox Cloud Gaming: If you own a digital copy of the game, you can sometimes stream it to your PC via the Xbox app. However, due to licensing issues with cars and music, Forza Horizon 2 was "delisted" from the Microsoft Store years ago. This means only players who purchased it before 2018 can access it digitally. If you decide to try the emulation route