After two phone calls and 4 email, screen shots and "diagnostics" sent, there still is no solution that works for me. The Support tech Jeffrey Gilbert emailed today to say
"I know our engineers are fully aware of this issue and just yesterday they provided us with some basic troubleshooting steps (sign out of App Store, restart Mac, sign in and try download again). However, they are also asking for info about this issue and some specific diagnostics as well, so I know we may not have a full solution just yet. If you have time today to gather some diagnostics please let me know."
So itried all of the above (below) procedures. Signed out of the App store. Trashed Logic from my Apps folder. Restarted. Signed back into the App store. Got same message as always... "We could not complete your update. Logic Pro can't be installed on 'MacintoshHD' because MacOS version 10.15.7 or later is required". I've never gotten the option to update the version that is compatible with my OS.
I need to upgrade to Logic 10.5. I am NOT willing to chase my tail updating my OS only to then have to update my apps, my plugins, etc etc etc. C'MON Apple. WTF. Working Professional here! Ableton 11 is Looking VERY APPEALING..