Installed the latest version of att for retail via the twitch app but then when I refresh the addons it changes to classic, I have tried reinstalling the addon via the twitch app and the same problem occurs. Someone I know is also having this same problem. Details! and Bagnon also have this same issue.

Same issue here. Plater is another one that is broken now too. Not sure what would cause so many different addons to have issues like this?

it's a recurring issue with twitch. scanning your game library/double-checking the installation file path on twitch may help. you can also manually download the correct addon version from curseforge, but that won't stop twitch from suggesting the wrong one in the future.