Not really sure where to post this, but the plexmediaserver script is broken on the latest firmware, running on a 5big2.
It seems that the plex-downloadpage has changed.
Also, the synology version is ARM7, I am not sure if that'll work on those lacies.
Quick and dirty "fix": I used this as source: https://usdl.synology.com/download/Pack ... 0-cece46d/
It gets dirtier: I copied the download url to a txt, put that on a http server, and changed the plex.tv/downloads-url to my txt-file.
It should be an easy fix for someone who's a bit more familiar with linux and scripting. Not sure if the official plex download page will be useful anymore, with the arm7 version of plex.