Windows 10: I was asked for product key while upgrading to Windows 10

Hi, I upgraded from Windows 7 to Windows 10 two years ago. I don't remember whether I was given a product key during the upgrade. A month ago, I had the blue screen problem and no matter how I tried, the problem could not be resolved. So I reinstalled my purchased Windows 7. Now I upgraded to Windows 10. But I was asked for the product key which I don't have. What should I do now? Thank you for your help.

:)

 

Windows 10 Upgrade Assistant asking for product key


So make sure that you are attempting to upgrade to the Home Single Language Edition. The "about" system settings screen will tell you if it is 32-bits or 64-bits (operating system):





Using the media creation tool, you want the matching 32-bit or 64-bit Single Language Edition:





From the Windows 10 ISO download site, it's just listed as Single Language Edition:





Doing an upgrade to the correct edition Anniversary Update should not ask for a product key.

 

win 10 upgrade asking for product key


An upgrade to Windows 10 running properly will not ask for a product key. Are you sure the version on the USB is the exact same version as the previous operating system on the computer you are trying to upgrade? Pro or home; N, standard, or Single Language Version? If you continue with an upgrade that is asking for a product key, it will not activate.

A clean install will ask for a product key, and that can be skipped. Unless you have purchased a license for Windows 10 that has it's own unique product key, you should never enter a product key when upgrading or clean installing Windows 10.

 

win 10 upgrade asking for product key


Just try it through Windows update, you shouldn`t have any issues.

Excellent question Navy, that`s probabaly why. If not then, as suggested, just use the Media Creation Tool and choose upgrade this PC in Step 3.

Windows 10 - Upgrade Installation - Windows 10 Forums