Good morning,
Saw your message about KB5015882 so thought I'd check it out. It was available for download and install when I checked for updates. I didn't disable or change anything before starting the update. It downloaded fairly quickly, only stopping at 5% for several minutes. Next thing I knew it was at 100% where it proceeded to do the install. It slowly proceeded to 25%, waited a bit, then on to 35%. Again, a bit of a wait then slowly proceeded to 69% - another short wait, off to 88% then a slow but steady progression to 100%. Gave me the Restart button which I clicked. Reboot went fine, "Updates are Underway" went fine and then back to my login screen. No burps or errors of any kind. Altogether the download, install, and update took all of about 10 minutes or so to complete.
As I stated at the beginning of this post, I never had to disable, shut down or turn off anything to perform the update. I hope that helps someone.