Just as FYI - although I also had serious problems attempting to update to earlier versions of 24H2, the March version installed smoothly and has been running without incident.
Thanks! I just tried again (accidentally) and it failed in the middle. My laptop was docked at the time, so that might be related? The bug was that windows resized when I docked/undocked, so that particular one might not be fixed yet. But I'm glad it's getting better!