Before diving into the nuances, the most important conclusion must be stated clearly: Grand Theft Auto V (GTA 5) does not exist on the PlayStation Portable (PSP). Soni Typing Tutor 3.1 4 Activation Key Free Download Official
There is no official ISO, no leaked beta, and no "compressed" version of GTA 5 that runs on PSP hardware. Searching for "Top 19" links will only lead you into a maze of fake download buttons, surveys, and potential malware. Fast2001ocx Fix Site
The concept of is a complete scam. It preys on the lack of technical knowledge regarding hardware limitations. There is no "Top 19" list that will provide you with a working version of GTA 5 for the PSP because that version does not exist in any playable form.
You are far better off playing the legitimate PSP titles or using a modern platform (PS4/5, PC, Xbox) to play the actual game. Do not waste your time or risk your device's security on these fake downloads.