New version doesn't work

How do I switch back?
Came home to find the ‘new plex’ and after signing in and linking my account, selecting my user I get the welcome to our new app’ screen again with a spinning orange circle in the middle and cannot click the ‘Got it’ button and goes no further.
Tried deleting the app and reinstalling.
The linking my account works instantly but can’t access either user on my server.