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Yesterday I powered on a small ATOM 330 server which was last started five years ago. Well, up came Windows 7 Professional and of course the normal zillions of updates appeared. Anyway, I wondered whether the now officially expired free update from Windows 7 to Windows 10 was still available. Google brought me to this link on www.zdnet.com .
In https://www.zdnet.com/article/heres-how-you-can-still-get-a-free-windows-10-upgrade/ the suggestion is to go to the Download Windows 10 webpage whioch I did. then I clicked the Download too now button. Thereafter I just followed my nose and two hours later my little server was proudly running a licemced version of Windows 10.
So the free upgrade from Windows 7 to Windows 10 is till available!