Thank you Kenjii - I found this thread seeking a way to continue to use my CS5.5 license as I'm also retired and doing pro bono work. Working with El Cap for years, I finally bought a new camera who's RAW files were not readable by CS5.5 but could be read by DNG13.2... and that version of DNG would only run on Mojave or later. So I had to upgrade my MacOS. The "correct answer" and others on this thread might have deterred me, but horst_weisner's post gave me some level of confidence and yours cemented the deal. I went ahead and installed Mojave over El Cap and have had the exact same experience as you have described. All components of Adobe CS5.5 are still working including keyboard commands, with a few minor quirks under Mojave.
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