That being said, if you're looking to download the GTA IV executable file, here are some general steps:
Grand Theft Auto IV Executable: Essential Guide and Troubleshooting Gta Iv Exe File Download
In 2020, Rockstar Games updated the game to "Grand Theft Auto IV: The Complete Edition." This version combined the base game with the Episodes from Liberty City DLC (The Lost and Damned / The Ballad of Gay Tony). That being said, if you're looking to download