Update from 21.0.3 to 22.0.0. via zip fails

I checked the website and found release 22.0.0. It is not yet in the stable channel for web based update, however it is for Beta and as installer files (zip). I tried both versions and both fail with a bunch of errors, mostly: Application update XYZ not found. Remove those apps gets me over this error - however I gave up after four (Restore the app/db and retry).
Do I have to wait for the release channel or is it the end of the line and I need to install from scratch? To be honest, this is the first time this happened (I was an early adapter and used it from start - so not a newbie) - looking through logs is not shedding any useful light on this.

Any ideas welcome,