Because the PSP hardware was discontinued long before this game was developed, there is no official "PSP file" or ISO for Ragnarök. If you see sites offering a "God of War Ragnarök PSP download," be very careful—these are often scams or malware.
Let’s state this clearly from the start: It was never released for the PSP, PlayStation Vita, Nintendo Switch, Xbox, or PC (officially, as of this writing). god of war ragnarok psp file download best