Call of Duty Modern Warfare/Warzone

[dj56dt58]

I have owned the COD MW disc for a while, I bought that particular game for split screen play. Recently it updated and is now COD MW Warzone which is a completely different game without split screen. Is anyone familiar with this and how to get it back to the regular MW? I uninstalled and reinstalled which took forever, and got it back to MW, but in order to play it I had to download the update which again changed it back to Warzone.