Windows

The plug-ins folder on Windows is located inside of the user directory.

%LOCALAPPDATA%\Plex Media Server\Plug-ins

macOS

Using the Finder’s “Go” menu, select Go To Folder… then enter the following in the dialog box that pops up:

~/Library/Application Support/Plex Media Server/Plug-ins

Linux

In general, the Plug-Ins folder for the various Linux versions of Plex Media Server will be found under:

$PLEX_HOME/Library/Application Support/Plex Media Server/Plug-ins

NAS Devices and Other Linux-Based Installs

Plug-ins files will be located in a Plug-ins directory inside the main server data directory.

Related Page: Where is the Plex Media Server data directory located?