I don’t know why but here’s what happened:
Played WoW Classic
Uninstalled Classic
Installed WoW Retail
Played Retail
Quit Retail
Restarted computer
Battle.net started updating Classic even though I had it uninstalled?
It started downloading a 2GB of files so I canceled it
Uninstalled whatever was under Classic
Went to play Retail but it was now uninstalled
Extremely frustrating to just have 100+ GB of files just gone and now I have to sit through this extremely long download again.