There is no official version of Resident Evil 4 for the PlayStation Portable (PSP). While the PSP can play older entries like Resident Evil 1, 2, and 3 via PS1 Classic emulation, Resident Evil 4 was never ported to the system by Capcom.
Use your own disc and a PC DVD drive to create an ISO using software like ImgBurn or CDBurnerXP. Alternatively, if you own the game on Steam or PS3, you can locate tools to extract official ISOs (check GBATemp or Wololo forums for legal extraction guides). i--- Download Resident Evil 4 Psp Iso
: Some dedicated modders have used the engine from other PSP games (like Syphon Filter There is no official version of Resident Evil
Fake ISOs/Scams: Many sites offering a "full high-graphics" PSP ISO for RE4 are providing fake files that could contain malware or are simply other games renamed. Better Alternatives Alternatively, if you own the game on Steam
