When I try to install the Plex Media Server plugin v1.40.4.8679, after a while I get this message:
Error: plex had a failure Exception: RuntimeError Message: pkg error: - ffmpeg : Refusing to fetch artifact and run post_install.sh! Partial plugin destroyed
First, plugins are dead and you definitely shouldn’t use them. Second, you’ll need to upgrade to CORE 13.3. But once you’ve done that, there’s a script to install it for you:
Discussion of that script, and issues (if any) with it, here: