To ensure the security of your computer and the integrity of your game files, you should only download GTA IV from verified digital storefronts. As of 2020, both the original game and its expansions were merged into .
If you need the .exe file for modding or troubleshooting, it is located within the game's installation directory. The exact path depends on your platform:
The Steam Store offers the Complete Edition for approximately $14.99 USD, which includes automatic updates and file verification tools. How to Locate the GTAIV.exe File