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#11
What @Fabler2 posted is true. Upgrades purchased from the Microsoft Store are for that computer only. That's why it is cheaper, you can't move it from computer to computer. Now, what happens to the license for the Surface Pro 4? It is forever stored on Microsoft Activation servers based upon the unique hardware ID for that Surface Pro 4 and you can't do anything about it. Windows 10 Home can always be activated on that Surface Pro 4 with the product key stored in it's UEFI firmware. Windows 10 Pro can always be activated on that Surface Pro 4 with the generic product key VK7JG-NPHTM-C97JM-9MPGT-3V66T. It does not matter who owns or logs in to that computer.
That is good to know, all my activate 10 PRO pc have that same generic key. I have done reinstalls, skipped typing in any key and just logged in. Another PC I bought on ebay as a bare motherboard, I installed 10 PRO, skipped typing in key, logged in with MS account and it was activated.