How do I launch a Plugin? Not visible in the Plex Menu

Plex Media Server
6

Agreed. Most devs have opted to develop scripts that work outside of Plex such as the DizqueTV project. or xTeVe - IPTV for Plex DVR

GitHub - vexorian/dizquetv: Create live TV channels from your own media. Access the streams using the simulated HDHomerun tuner or the generated M3U URl.