The "Forza Horizon 1 PC download" on Apunkagames is not an official port, not truly "updated" for stability, and carries significant security risks. You will likely waste hours troubleshooting crashes or, worse, infect your PC.
Because Forza Horizon 1 was originally an Xbox 360 exclusive, the "updated" PC version comes pre-packaged with the Xenia Emulator , optimized specifically to run this game. forza horizon 1 pc download apunkagames updated