Thanks so much for your suggestions. Unfortunately, the list of compatibility options only goes backwards to previous versions of Windows and not later versions.
However, on the same compatibility tab, there is an option to run as administrator. So I tried that and bingo, it at least allowed me to install Zwift. The I encountered the next problem…
Now, after I try to run Zwift, it says “ZwiftLauncher has stopped working…a problem caused the program top stop working…” I have tried running it several times now and same problem.
Any further suggestions?