Glad you were able to find out, although I don't know the situation with updaters, etc. I actually have been testing Mojave on an external SSD, along with all my applications (except for one of them Tech Tool Pro which is not yet compatible, and replacing the High Sierra version of Onyx with the Mojave version), documents, settings, etc. The only application I am getting a warning about liKE you is Quicken 2007, which I expected (I also have Quicken 2016). Again, though, with Adobe Acrobat X Pro, I don't get such a warning (I only use that Adobe product for reading PDF documents).