Restart computer and suddenly I have to install the game again?

So, I was trying to download the ultra textures pack and had the same problem as everyone, immediately jumped to 70% and didn’t change from there, decided I would restart my PC to see if that fixed the problem… all of a sudden the Xbox Games Pass ap is saying that I need to install the game?!? what the actual fk? I was literally just playing it and now It needs to be installed again… Can anyone offer any insight to this?