Method 2: Manual File Installation (For Standalone/Repack Versions)
If you successfully install the English pack and notice (only subtitles), do this:
Depot 42683 (Call of Duty Modern Warfare 3 english) · SteamDB
If you can tell me (Steam, cracked version, console), I can help you find a more specific solution.
Verify that iw_22.iwd through iw_24.iwd (or equivalent English audio archives) are present. Game Crashes on Startup