Updating Jellyfin

[TheDreadPirate]

Your Jellyfin permanent data should be in C:\ProgramData\Jellyfin (ProgramDATA not Program Files). You would simply make a copy of that directory before performing any upgrades.

You'd download the latest installer and run it. If the upgrade goes sideways, you'd uninstall Jellyfin completely, download the installer for the original version and install that instead of the latest. Your signature says 10.9.9, the download for that is located here.

https://repo.jellyfin.org/archive/server...9.9/amd64/

After reinstalling 10.9.9 you would restore C:\ProgramData\Jellyfin from the copy you made earlier.