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Verify you still have all the metadata in the Plex share (Library/Application Support/Plex Media Server exists and is not empty). If true, proceed.
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Uninstall + ERASE (to remove the errant installation)
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Control Panel - Security - Set the timer to 65536
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Signout of DSM, restart DSM , Sign in – to use the new idle timer.
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Download and install PMS from Plex.tv/Downloads
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Observe it telling you how to fix permissions – Follow them.
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Obverve migration kicking in because “Installing” spins for a while it processes all your metadata. Be prepared to wait a considerable amount of time. (2-3 minutes / 1000 indexed items (movies, episodes, photos, music tracks)
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When complete, There will be a “Blue” bannered popup reminding you of the permissions settings procedure to grant PlexMediaServer permission to read youe media on DSM 7 (we do not use “Plex” user anymore)
Details of what changed, Migration instructions (screenshots), and then supplemental changes as of 1.24.2.4973 (new shared folder & structure)
Initial release & Migration instructions
Supplement