Glad to see the patch out, but had a problem. Some of my add-ons were there, others were not. Dropped out of game and re-installed via Twitch successfully, but they still were not there when I logged back into the game.
Despite what I’ve seen elsewhere about the main folder being renamed, that did not happen here (maybe i misunderstood about “renaming” vs “duplicating”). I have two WoW folders:
C:\Program Files (x86)\World of Warcraft_retail_\Interface\AddOns (100 sub-folders, all created today)
C:\Program Files (x86)\World of Warcraft\Interface\AddOns (180 sub-folders, created over the past several years)
The game is reading the first one, under _retail_, but not all of the add-ons were copied over (just the first 100). When I copied the full contents of the second one to the first one, all of my add-ons are back.
To get Twitch to install to the proper folder:
Settings → Addons → Games
“Retail” is a “new” game in the drop-down list.
Several similar posts, but had their own tangents: