It's an easy process, you just have to copy one folder to any destination of your choosing (ie your Desktop)
Copy %USER%\AppData\Local\Plex Media Server\Plug-in Support\Data\com.plexapp.plugins.wso\
Copy ~/Library/Application Support/Plex Media Server/Plug-in Support/Data/com.plexapp.plugins.wso/
Copy /var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Plug-in Support/Data/com.plexapp.plugins.wso