I uninstalled Hearthstone and Starcraft. I went to play some Classic wow and noticed it wanted a massive update. Turns out the update was ‘reinstalling’ the game. All my mods are gone and settings, it’s completely wiped the folders. It’s done it for retail wow as well which is really strange.
Seems like a big bug, if it’s causing games to remove all files. I never had to click a install button, only just update.