[Updated 26/05/17 this still works]
Reportedly you can still get a Windows 7 (or 8) - Windows 10 free upgrade the following way:
(Requires **erasing your PC** and some advanced knowledge of boot selection and install procedures, only for power users and make your own investigations before attempting this)
I expect this opportunity will only be for a limited time MAKE YOUR OWN INVESTIGATIONS BEFORE ATTEMPTING THIS.
THIS INFORMATION PROVIDED WITHOUT WARRANTY OR OFFER OF FREE SUPPORT.
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Digitalwelcomemat provides IT consultancy and services for business customers on the NSW Central Coast in Australia.