That’s strange. So when you say you’ve uninstalled and reinstalled it, does that mean you ungraded it back to 2.2.0 then tried the downgrade? If so I’d try a fresh install of 2.2.0, redownload the downgrade file (to make sure that there’s nothing wrong with the file) and try applying the downgrade again. If that still doesn’t work, I have a 2.1.1 base installer that I could send your way. Just PM me if you want it.
As for the scheduling, we play every Saturday 20:00 – 00:00 UTC. We have been known to end earlier or later, though, depending on the mission.