If you want to use the PPSSPP emulator, you should look for the games that were for PSP: 0;16; 18;write_to_target_document7;default0;1dd;
If you haven't already, download and install PPSSPP on your device: gta san andreas ppsspp iso file 7z download work
If you still want to proceed with the "PPSSPP ISO" route: If you want to use the PPSSPP emulator,