Re: How do you abort the update?
You're fine. I'm running the Creators Update without any issues so far. I just let the PC do its own thing. I didn't even notice it had happened until I expanded my taskbar icons and there was a Window Defender icon with a green checkmark in its lower-right corner.
Microsoft just doesn't want people to go get it and force the update manually. If the update is happening on your PC without any prodding by you, it means Microsoft has blessed your PC to get the update.