Because the PSP lacks the hardware power to run the actual GTA 4 engine (RAGE), any "GTA 4" file found on community sites like pspisoclub is a fan-made modification of an existing PSP GTA title

Instead, respect the hardware limits:

What if Rockstar had ported the HD world to the small screen? Safety and Installation Tips

: Because these are fan-made mods running through an emulator, performance varies wildly. A modern smartphone is usually required to maintain a playable frame rate. Safety First

: Sites like "pspisoclub" are third-party hosting platforms. Always use caution when downloading ISO files and ensure you have active security software, as these sites can sometimes host intrusive ads or unwanted files.