Rolling back on Windows works as follows:
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note down your current Plex Server software version
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Stop Plex Server using its tray icon.
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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.
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go to your Plex data folder.
There is a subfolder in there, namedUpdateswhich will contain previous versions of the installer .exe -
execute the installer for the previous software version
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reboot Windows (just a safety measure, it may work without rebooting as well)