Three updates were installed over two days. There was no indication that any updates were installed. I power down my computer every night. Today, while checking for updates, I found that I had these updates installed and there was an indication that a restart was needed.
1. Why isn't there some kind of notification that a restart is needed?
2. Why didn't the updates installed when I power down?
Do you have fast-boot turned on? See Reboot after Windows Update vs Shutdown and restart - Windows 10 Forums - it could be the same issue.
I'm not sure about notifications. Normally it will schedule a restart for 3:30 am or some other time you don't often use your PC but if you always shut down before then I'm not sure what happens. Presumably it will eventually do it's reboot.
I do have fast boot turned on.
As is mentioned on any number of programs' updates there is a need to unload files from memory so the new files can take their place, quite a common occurrence and as Windows versions have progressed the need has become somewhat less when compared with Win98, WinME, etc.
Quote