Technical limitations prevented Rockstar from porting the game to older hardware:
Here is a detailed look at why this file does not exist, what you are actually downloading when you click these links, and the best alternatives for playing GTA 4 today. Why GTA 4 on PS2 is Technically Impossible
Grand Theft Auto IV was never released for the PlayStation 2, and a legitimate "GTA 4 PS2 ISO" does not exist. Rockstar Games built GTA 4 specifically for the PlayStation 3, Xbox 360, and PC. The game relies on an advanced engine that the PS2 hardware physically cannot support. Why GTA 4 Cannot Run on a PS2
ITEM HAS BEEN ADDED TO CART.
Keep On ShoppingEmail Address
Receive latest gaming news,promotions and game guides updates.Password
Receive latest gaming news,promotions and game guides updates.Email Address
Receive latest gaming news,promotions and game guides updates.Please enter a valid Email.
Password
Receive latest gaming news,promotions and game guides updates.6 to 16 letters, numbers, and special characters.
Confirm Password
Receive latest gaming news,promotions and game guides updates.