Old and new PMS installed, where's my metadata?

You have Plex Media Server as last part of the LocalAppDataPath. Which causes a new Plex Media Server subfolder to get created inside of E:\Plex Temp Files\Plex Media Server.
Which means your currently used Plex data are inside of
E:\Plex Temp Files\Plex Media Server\Plex Media Server
(notice the double “Plex Media Server”)
i.e. a Plex data folder inside of an older plex data folder.

Next time please use this: [HowTo] An extended guide on how to move the Plex data folder on Windows