Windows update got stuck here four weeks ago and stayed stuck, despite all I could find in TechNet, google, or my notes, and despite two sessions with microsoft paid extended support.

Loh! Last night the computer rebooted and had the current update ready to install, which install went flawlessly.

NEVER seen a computer SNAFU heal itself before, not in 50 years of being abused by computers.

My only clue is that I had exited the Windows Insider program for four days and then rejoined....