Some independent developers create small, fan-made racing demos inspired by Forza and package them as ISO files. These are not the full Forza Horizon 3 experience [3].
Only download ISOs for games that were actually released for the PSP. Sources: forza horizon 3 ppsspp zip file work download work
Forza Horizon 3 is an Xbox One and Windows 10 exclusive. Because the PSP hardware is significantly less powerful than these platforms, a direct "work download" of the full game for an emulator does not exist [2]. Why You See "Forza Horizon 3 PPSSPP" Downloads Some independent developers create small