Uninstall the DSM 7 package with the ERASE option.
This cleans out the rogue DSM 7 folder.
Set up the permissions on the Plex shared folder (make certain to get it exact)
so the installer will do the migration (move from DSM 6 → DSM 7 ) for you as it installs.
It will sit at ‘installing’ until complete.
Plex/Migration.log will allow you to follow its progress.
“Scenario 2” is the most common now.
After all is complete, you’ll want to give the new username ‘PlexMediaServer’ access to your media shared folders
