Sonoma 14.1.1 is the Mac OS.
I don't know the name or number of the latest XLD, but I was asked if I wanted to upgrade, so I said yes.
I then reviewed links to some of the older versions of XLD, and ended up installing Version 20211018 (154.0). It is working fine now. I don't know if this is the version I had been using before I was prompted to upgrade, or if it is earlier. Either way, it is working fine.