Now we’re getting somewhere. I went through the settings, and I’m pretty sure I now have it set to allow updates from all repositories. Then I looked at the source, and it’s not available! Somewhere along the line, I think the source got moved! I’ll ask the dev about this.
While I was poking around, I saw an addon named PM4K for Plex, and installed it. It works! HDR, Atmos, everything works. The user interface is nowhere near as good as PKC, it’s very much like the client Plex makes. I think if I get the PKC repository sourced right, I can get to the new versions. The developer was away for awhile, and then Kodi went through a lot of changes, who knows?
One more thing that’s been happening–on occasion, I get an annoying Embuary Info error that makes a loud noise. It’s not consistent, so I don’t know if I can catch it in a log. Any ideas on that? It’s not a big deal, but it’s annoying.
At least for now, I have Plex working with honest to goodness HD sound! Thank you for your help. What a puzzle!