I've updated to v55 manually, through here as v54 is showing as 'current' through Curse Client - are Curse being slow or are they now pointless as an add-on updater?
I uploaded version 55 to curse... it is definitely there in the twitch app. Why it is showing earlier versions as "current" I can't really say... I don't think I have any control over that.
The Curse Client is no longer maintained/supported, addons can no longer be updated using it iirc. Please update to the Twitch Desktop App.
It does... it's just that CC wasn't showing v55 as current.