The keyword "highly compressed repack" usually implies you have limited hard drive space or a slow internet connection. While you can't play it on PS2, you can play the PC version of GTA IV on modest hardware if you use legitimate, optimized versions.
The Legitimate Path: Buy GTA IV on Steam or Rockstar Games Launcher. The complete edition includes "The Lost and Damned" and "The Ballad of Gay Tony."
The "Low Spec" Setup: GTA IV is notoriously unoptimized for PC, even on good hardware. To get a "compressed-like" low-storage experience: gta4 ps2 iso highly compressed repack
No ethical "repack" will compress a 16GB game into 500MB. At best, a repack removes audio languages and movies, saving 3-4GB, but it will never fit on a CD-ROM.
To summarize the search for "gta4 ps2 iso highly compressed repack" : The keyword "highly compressed repack" usually implies you
Don’t let nostalgia make you a victim of malware. Respect the hardware limits of the legendary PS2—it gave us San Andreas; it simply wasn't built for Liberty City in 2008.
Save your bandwidth. Save your PC. Play the real thing. No ethical "repack" will compress a 16GB game into 500MB
The most important fact to address immediately is that Rockstar Games never released Grand Theft Auto IV for the PlayStation 2.
When GTA 4 launched in 2008, it marked a generational leap. It was built from the ground up for the PlayStation 3 and Xbox 360. The game utilized the RAGE (Rockstar Advanced Game Engine) and the Euphoria physics engine, technologies that were simply too advanced for the 64MB of RAM and the Emotion Engine CPU found in the PlayStation 2.