I spent a month like this, on an always-on system, trying to shut down the upgrade downloader from the task bar whenever I can after failing to stop it from settings, group policy, horsing around in powershell etc. Before that, I had also tried to make the upgrade work by doing it manually, updating drivers, unplugging all the peripherals etc. but it kept getting stuck halfway through. So I couldn't upgrade, and I couldn't not upgrade.
Well last week there was an update to the update so I hoped at least the upgrade would work now and I would be done with this charade. Nope, it crashed again while upgrading, except this time there was no way to roll back and use my system. I am torn between cutting windows out completely and going back to windows 7.
Compare this with most linux distributions. The updates can run in the background, the update process is often significantly faster and finishes in a few minutes and finally I don't need to reboot unless the kernel is updated.
Windows update is definitely my #1 reason to switch to linux.
FreeBSD forever :)