You can stream the game on mobile devices via Xbox Cloud Gaming (Game Pass Ultimate). Best Alternatives for PSP Racing
The PSP, released in 2004, has hardware capabilities that are vastly inferior to the modern consoles (Xbox Series X/S) and PC required to run Forza Horizon 5. forza horizon 5 psp iso download link
If your goal is to experience the actual, authentic Forza Horizon 5 game on a mobile device or a handheld emulator console, you do not need a PSP ISO. You can play the real game using modern cloud streaming technology. 1. Xbox Cloud Gaming (Xbox Game Pass Ultimate) You can stream the game on mobile devices