Because there is no legal Far Cry 4 file, you will need to use your own physical PSP games. To play a game legally on PPSSPP, you first need a digital copy. The safest and most legitimate method is to purchase PSP games digitally from the PlayStation Store on a real PSP or PlayStation Vita. Alternatively, if you own the original UMD, you can use a custom firmware-enabled PSP to create a digital backup (an .ISO file) from your disk.

He deleted the file. He cleared his recycling bin. He ran a virus scan. Everything was clean.

Because Far Cry 4 was built for advanced systems like the PlayStation 4, Xbox One, and PC, the PSP hardware cannot run the actual game. When you encounter websites offering a "Far Cry 4 PSP ISO" or "PPSSPP download," you are usually looking at one of three things: