Update:
It appears that more of my system is screwed up than meets the eye (Thanks for hard-crashing my system MSFS-2024!)
-
I tried uninstalling both 2024 and 2020, and then deleting the associated folders. Now, neither one will install/run.
-
System Restore is also borked.
-
I am going to try a
DISMand a/sfc /scannowto see if that helps. If not, I’ll have to try restoring a backup.

Well, I’ve found a legitimate beef right off the bat.
If you (ahem!) “assume” that the respective game installers know what they’re doing, you are in for a rude awakening.
Apparently MSFS-2024 defaults its installation directory to the same place MSFS-2020 is installed.
The result is a crashed MSFS-2020 installation. . .
I suspect I will have to uninstall MSFS-2024, uninstall 2020 as best I can, wipe all traces of them from my system, and re-install both of these beasties from scratch.
Oh goody! I am so on-board with this nonsense. . .

