Please Uninstall (with Erase option) the PlexMediaServer application. This is the first step toward recovering from this condition.
The package installer is sensitive to two things:
- There is an existing “Plex/Library/Application Support/Plex Media Server” which it can read.
- There is no existing “PlexMediaServer/AppData/Plex Media Server”
If it cannot read “Plex/Library/Application Support/Plex Media Server” then it assumes this is a new installation.
Given you did not see a warning, and the installation completed quickly, I suspect it could not check the contents of the Plex shared folder.
(We have no administrator privileges during installation on DSM 7. On DSM 6, we did have the permission. This is one of the many changes Synology made in DSM 7)
To complete recovery from this and prepare for installation & migration.
Now follow this How-To to set the permissions for the “Plex” shared folder and allow installation & migration to proceed normally.
