For GTA V, you would need to play it on a compatible console or PC via an official purchase (Steam, Rockstar Games Launcher, PlayStation Store, Xbox Store, etc.).
Any "GTA 5 PSP ISO" download links you find online are typically one of the following: Mods of Older Games: download gta 5 psp iso file by tp install
To install a GTA 5 PSP ISO file, follow these steps: For GTA V, you would need to play