I've been working on a new addon updater since the recent announcement of Twitch ditching the updater soon.
It's under development but I'd love some feedback if anyone is interested!
Check it out here, Unfortunately I can't post links yet wowup.io
Currently should support most features of the existing Twitch addon updater, with more features planned if there's interest!
Hop on the Discord if you have issues or just have questions, can be found on the website