2. If Windows 8.1 was on your laptop when you bought it, you must use your laptop's dedicated recovery media to reinstall Windows or ask the laptop vendor for help with the product key. However, I suspect we are not talking about an OEM copy. In your title, you've said "Windows 8" while in your message body, you exclusively said "Windows 8.1".
It didn't even ask for a product key. The laptop apparently has the windows 8.x key stored inside its firmware. Saved me some effort as I didn't have to install windows 8 first. So it seems windows 10 does not need a windows 10 license in the case you had a genuine Windows 8.
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does windows 8 product key work for 10