I'm a bit suspicious of this, but the source (of the info.) seems OK:
http://www.tomshardware.co.uk/micros...ews-57284.html
the link goes to:
https://uk.scdkey.com/microsoft-wind...opping_misc-21
Too good to be true?
I'm toying with the idea of putting W10 on a spare HDD (but I could still get free, of course), as an 'upgrade' to W7. If it's on another disk I can just dump it - seems a good precaution!