Hi. I have Windows 10 Pro. I got it from taking advantage of the 'free' upgrade by upgrading Windows 8.1 Pro (retail). I recently asked on the Microsoft forum about migrating my Windows 10 Pro licence to a new PC as I was under the impression that a retail version of 8.1 would mean I would get the entitlements of a retail version of Windows 10. However, I have now been told that this is NOT the case as the ONLY way to install Windows 10 would be to install 8.1 first and then do the upgrade... a method which is no longer free... and so I have been told by a Microsoft Support Engineer that I have to buy Windows 10. This also means that any 'critical' hardware change or upgrade (especially the motherboard) means you lose your 'free' version of Windows 10. Can anyone help with this?