Never. PPSSPP is a PSP emulator. To run GTA 5, you would need a PS3, PS4, Xbox, or PC emulator. Even then, mobile devices are not powerful enough for full-speed GTA 5 emulation.
As he extracted the files, Alex's excitement grew. He had always wanted to play GTA 5 on-the-go, and this seemed like the perfect opportunity. He opened the PPSSPP app on his device and selected the GTA 5 ISO file. gta 5 ppsspp download iso zip file for android upd
was never officially released for the PlayStation Portable (PSP) you would need a PS3