So for those who may have missed it Twitch sold Curseforge back in June of this year. As a result of this addons are no longer supported in Twitch. The new owner Overwolf has rolled out a new updater and it’s in alpha. You can find out more about it here on their site Overwolf. There are other altertnatives to curseforge and you can read about some of them here at Blizzard Watch
This does affect both Classic and Retail .