PPSSPP is an emulator for the , a handheld console released in 2004. The last Forza game to appear on a handheld was Forza Horizon 2 Presents Fast & Furious (very limited) and never for PSP.
The PSP (the console PPSSPP emulates) was discontinued long before Forza Horizon 5 was even a concept. forza horizon 5 para ppsspp file download for android