After originally being updated on Steam to include the original GTA IV story DLC’s (The Lost and Damned and The Ballad of Gay Tony), Grand Theft Auto IV – Complete Edition is now available on the Rockstar Games Launcher and Steam for purchase.
Starting today users who owned retail versions of GTA IV on PC can get their copy of the Complete Edition by redeeming their retail code on the Rockstar Games Launcher in the Store tab.
As mentioned before, this version has multiplayer removed, so if you still want to play that, you will have to, for the moment, stay on an older version of the game.