Can I reuse a Windows license?

Re
3

I have a laptop that contains Windows 8.1 with a valid license. If I update the laptop to Windows 10 Home with the Microsoft MediaCreation tool, will the old Windows 8.1 license be reused or do I have to buy a new Windows 10 Home license first?

Na
Ar

I think that should work. But don't know how.

te

It should work like this. In the worst case, a Win10 license won't cost you 30 euro on Amazon. Be careful with re-sellers, if it's only 3 euro, stay away.

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