If you want to return to Liberty City on the PS2, this is the official way to do it. It uses the GTA 3 map but with refined mechanics.
A "repack" usually involves stripping out non-essential data (like multi-language audio or high-res textures) to make a game file smaller. While a standard PS2 DVD holds about 4.7GB, compressing a massive 15GB+ PS3/PC game like GTA 4 down to a PS2-readable format is technically impossible without losing the core of the game itself. Best Alternatives for PS2 Owners gta4 ps2 iso highly compressed repack
If you find a website offering a "highly compressed 50MB ISO" of GTA 4 for the PS2, you are likely looking at one of three things: If you want to return to Liberty City
This is the most common "fake." Talented modders take the GTA: San Andreas engine (which does run on PS2) and swap out the character models, vehicles, and UI to look like GTA 4. While it might look like Niko Bellic is running around, it is still technically San Andreas. While a standard PS2 DVD holds about 4
You can find legitimate skin replacements for the PC version of San Andreas that let you play as Niko, though this won't work on an unmodified PS2 console. Final Verdict
Don't risk your computer’s health downloading suspicious files. Because the hardware architecture is fundamentally different, GTA 4 will never run on a PlayStation 2. If you want to experience the HD era of Grand Theft Auto, your best bet is a second-hand PS3, Xbox 360, or a modern PC.
Some "highly compressed" downloads are actually just low-quality videos of GTA 4 gameplay meant to trick the user into completing surveys. The Technical Reality of "Highly Compressed" Repacks