- Windows 10 RTM --> 1511 or 1607 release (November Update or Anniversary Update)
- Any build to a newer Insider Build (up to end of October 2016 at least)
Here's the video:
Why would a bad guy do this:
I sadly can't offer solutions better than:
- Don't allow unattended upgrades
- Keep very tight watch on the Insiders
- Stick to LTSB version of Windows 10 for now
(Update 6.12.2016: Read the next blog as well: http://blog.win-fu.com/2016/12/every-windows-10-in-place-upgrade-even.html )
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And you can learn how to find these by yourself by letting me teach you some Windows Internals!