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#21
I never had to do this. I installed Windows 10 with internet off and all drives except for the target SSD disconnected. The setup never offered anything but the local user account. Afterwards, I connected to the Internet to activate Windows and it did not even ask me for the key (that I wrote down from the download site, that was not necessary apparently). So my Windows copy is not aware of any email addresses I might have and it never asks me to use any of them.