Forza Horizon 2 was never officially released for PC. It remains an exclusive title for the Xbox One and Xbox 360 consoles.
Outline of tasks, methods, and expected outputs Forza Horizon 2 Pc Game Download
Furthermore, the game reached "End of Life" status on September 30, 2018. This means it has been delisted from the Microsoft Store and is no longer available for digital purchase on any platform. How People Are "Playing" It on PC Forza Horizon 2 was never officially released for PC