The increased file size was "due to the increased amount of content" at launch, including map files🤑 for Warzone, as well as the Zombies mode, and the fact that a lot of content from Modern Warfare II🤑 carries over to Modern Warfare III.

If all you want to do is play the multiplayer version and🤑 you're happy to forgo the full visual experience excluding "high-rez" assets, then the absolute bare minimum install is 79GB. Add🤑 the single-player campaign sans high-rez assets and you're looking at 149GB.