Forza Horizon 1 was never officially released for PC. It was an Xbox 360 exclusive, and while later titles like Forza Horizon 3, 4, and 5 have official PC versions, the original game remains console-only.
Overview
Just as he crossed the finish line of the first heat, a window popped up over the game: "MEMORY OVERFLOW: CORE COLLAPSE."
Consequently, the "PC version" people search for is actually the original Xbox 360 ISO file running through an emulator, specifically
What You Actually Find on Pirate/Torrent Sites
After analyzing several actual results from this search term (via safe sandboxing), common outcomes include:
Forza Horizon 1, the first installment in the critically acclaimed Forza Horizon series, has been a favorite among gamers since its release in 2012. Developed by Playground Games and published by Microsoft Studios, this open-world racing game offers an unparalleled driving experience, boasting stunning graphics, engaging gameplay, and a vast collection of cars. While the game was initially released for Xbox 360 and Xbox One, many enthusiasts have been eagerly awaiting the opportunity to play Forza Horizon 1 on PC.