Ya, mine was doing that. COD1 and COD: UO kept flicking between each other so I disabled UO, finished COD 1, and then let COD: UO do its thing... One 'delete content files' and redownload later and 5 GB, I finally just paused it, restarted, paused it, and cancelled it off the download queue, and it didn't try downloading again.
Now it says COD 1 and COD: UO have 1 file fuxxored when I verify integrity. UO runs fine.
Game-wise, holy crap I forgot how much they improved the COD series since the originals. The super scripted, rail-shooter and auto-regen health with constant auto-saving is so much better than the original health pack and self-save thing.