Next time you go to play State of Decay 2, you may be prompted to basically reinstall the entire game.
Over the weekend, State of Decay 2 was updated, requiring a download that happens to be over 20gb in size. That is, the size of the game over again. Thus, we reckon that Microsoft is asking people to re-download the entire game instead of just a standard update.
To find out which bugs and issues this ‘patch’ addresses, refer the game’s updated patch notes, which can be found here.