Sites promising a "highly compressed" full ISO file of GTA 4 for the PSP are frequently clickbait. They often distribute harmful malware, adware, or non-functional zip archives. 🕹️ Official Grand Theft Auto Games on PSP
These are the most common. Modders take the engine of GTA: Liberty City Stories and swap out textures, character models (like Niko Bellic), and vehicles to mimic the look of GTA 4. Gta 4 Psp Iso File -