It sounds like you're looking for a GTA V PPSSPP file (a PSP emulator version of GTA V). However, it's important to clarify a few things first to keep you safe and informed.
B. Legal Issues
- Copyright Infringement: Downloading copyrighted game files (ISOs/CSOs) without owning the original disc is illegal in most jurisdictions.
- Intellectual Property: Distributing modified versions of Rockstar Games properties violates their IP rights.
- VirusTotal (upload the file)
- Malwarebytes
Stay safe, and enjoy the actual GTA library that does run on your emulator.