upgradePlex doesnt take Plexpass into account. I have plexpass and enabling it for the plex server produces an update message so I went to run updatePlex and it still finds the public release and so it wont update.
I’ve moved to using this script as it handles Plexpass and public releases and even auto updates.
It works really well.
Noted I have written the current to only take into account the Plex Public versions, however, I will see about working this one in if it can consider both. 
###Update
Since you are on the Development Channels @RXWatcher, I have pushed a commit that addresses this. It utilizes a customized QuickBox version of the MrWorf script.
####…and pushed to Public Channels