Plex stops immediately after starting (fresh install)

Wow. That is not making any sense.

Would you please do the following?

  1. Uninstall + ERASE this bad installation (unless you are preserving data).
  2. Download from here. (it’s the newer packaging and has a proven track record)
  1. Since there was a preexisting server identified for the Syno, you may wish to use the Plex Claim Token installation method to have it claim the server during installation.