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Yes, you just use the Win10 media installer (free download from MS) and buy a win10 key off Amazon or wherever.

Or don't. I ran Windows 10 with the upgrade nag message for 9 years.

Are win10 keys on Amazon legitimate, and how would I tell?

You could also buy a Win11 key directly from MS which will activate a Win10 installation if you're worried about legitimacy.

Ah, as long as Win11 keys can activate Win10, that works.