There was something wrong with the installer of the latest Coremelt update for Catalina. I had the same issue and have sent them a bug report. This morning they replied with a link to an updated version of the installer.
For me it was the installer for the "Everything" bundle, but my guess is that they also fixed the individual installers. If not, you can send a bug report. They do respond very quickly.
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CoreMelt Callout tracking - where did it go?
16 Oct 2019 13:44 #102077