Rolling back on Windows works as follows:
- note down your current Plex Server software version
- Stop Plex Server using its tray icon.
- uninstall Plex Server with the regular ‘Apps’ control panel of Windows. Do not use 3rd party ‘uninstaller’ software like Revo etc. Do not use Registry cleaners/optimizers.
- go to your Plex data folder.
There is a subfolder in there, namedUpdates
which will contain previous versions of the installer .exe - execute the installer for the previous software version
- reboot Windows (just a safety measure, it may work without rebooting as well)