Due to a update of a component required for some fixes to the HTPC and Desktop apps, 1.37.3 of HTPC and 1.67.2 of Plex for macOS are the last version macOS 10.13 can run.
Version 1.38.2 of HTPC which requires macOS 10.14 was released mistakenly released before disabling the auto updater for that version.
If you are running macOS 10.13, you can get the previous version of HTPC 1.37.3.3706 here and Plex for macOS 1.67.2.3705 here.
