On some PCs, changing compatibility breaks other things or causes a degradation of sorts. I noticed weird choppiness on mine that wasn't here before.
If you edit your launcher, what you're essentially doing is disabling BitRaider, which then makes you download the streaming portion of the game, which is the Asset 338 folder. That's why it's a 2 hour download.
The best fix for me was to disable bitraider, take the download hit, and not worry about that mess anymore.
That being said, instead, I just uninstalled and reinstalled via steam. Steam has no BitRaider, so no worries anymore. So if you have to make a fix, do it the steam way