The info here is incomplete for the Windows folder…
What’s incomplete about it?
If you paste %LOCALAPPDATA%\Plex Media Server\Plug-ins into the windows file explorer address bar and press Enter, you will be taken to the right folder immediately.
Browsed and did not see the local, sorry 
Actually, the folder is something like
C:\Users\<username>\AppData\Local\Plex Media Server\Plug-ins
However, AppData is a hidden folder.
So browsing to it won’t work (unless you have activated the file explorer preference to show hidden files and folder).
