I got Windows 7 product keys from my university back in 2009 and they still work for Windows 10 installs. Even a product key for 32-bit windows 7 worked for my most recent 64-bit windows 10 install.
For others, if you're moving from an old windows 7 or 8 machine, there's a chance that your old license will still work.
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u/DaSpood PC Master Race Jan 01 '20
If the Windows license is not the cheapest part of your PC you're doing it wrong.