To be direct: Forza Horizon 5 cannot be played as a PPSSPP ISO file because it was never released for the PlayStation Portable (PSP)
While was built for high-end consoles and PCs, the "PPSSPP ISO" version is a popular fan-made mod . These versions usually take a classic racing game (like Burnout or Need for Speed on PSP) and overhaul it with FH5 textures, cars, and music. forza horizon 5 ppsspp iso download android mobile new