It removed the defunct "Games for Windows Live" (GFWL) requirement.
The "Complete Edition" was released by Rockstar Games to replace the separate versions of GTA IV and Episodes from Liberty City (The Lost and Damned and The Ballad of Gay Tony). Key features of this version include: sc23385-GTAIVCE.part1.rar
Part 1 of a larger set (requires all subsequent parts to extract) It removed the defunct "Games for Windows Live"
Once all parts are present, extracting Part 1 will automatically pull data from the other parts to reconstruct the full game installer or folder (approx. 22GB+). Safety & Security Warning in the same folder.
Because this is labeled part1.rar , you cannot open or install the game using this file alone. You will typically need part2.rar , part3.rar , etc., in the same folder.