Check if specific "Content Packs" or "Map Packs" are uninstalled.
Ensure your launcher has administrative privileges so it can properly access the zone folder. Cod Mw3 Zone Files Download
This guide covers everything you need to know about zone files, how to fix errors related to them, and the safest way to manage your game data. What Are MW3 Zone Files? Check if specific "Content Packs" or "Map Packs"