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Uninstall current version of Plex Media Server. Use standard Windows uninstaller. No Revo, CCleaner, etc.
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Install desired version of Plex Media Server.
Startup will take longer as PMS has to update the database schema. If you see a 503 message in Plex Web mentioning database maintenance, then just wait and try a few minutes later.
PMS keeps three prior versions in the Updates folder of the Plex Data Folder.
Older (1.31.3) also available here: Plex Media Server support ending for older versions of Windows (7, 8, and 8.1), macOS (10.11, 10.12)
