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#11
OK here's what I did in the end:
- I attempted to close that window saying "Checking for updates"
- That lead to another window that got stuck too called "cleaning up" or similar.
So after a further 30 minutes I rebooted by brute force, ran CCleaner to remove any stray garbage, rebooted again and then ran the Get Window 10 icon.
This took quite a long time to run (maybe 1.5 hours or so) but it never got stuck in the same way. And here I am in Windows 10. I shall probably do a fresh install at some point, but at least I am now in Window 10 and I have hit the "upgrade by" date.