If you are seeing "PC download" links on third-party sites like ApunKaGames, these are typically not native PC versions of the game. Instead, they are often repackaged Xbox 360 files or potentially unsafe software.
Forza Horizon 1 was officially an and never received a native PC release. While "download" links for the PC exist on various third-party sites, these are generally not official versions of the game. forza horizon 1 pc download apunkagames hot