Forza Horizon 4 was never officially released for the PlayStation Portable (PSP), so an official ".iso" or ".cso" file for the emulator does not exist. However, many "PPSSPP files" found online are actually fan-made mods of existing PSP games (like Gran Turismo or Need for Speed ) with swapped textures and menus to look like Forza. ⚠️ Important Disclaimer Official Version: Forza Horizon 4 is an Xbox/PC exclusive.