Key for Windows 10 is available for purchase.
Key for Windows 10 is available for purchase.
Check if your 8.1 product key is still valid. If you have access to the original purchase details, they should list the key. Without that, you may need to contact customer support or look for a recovery option. If you use the key, try searching online for "8.1 product key recovery" or consult the device’s manual.
Upgrade to a newer version, such as 8.1 or later. Using the media creation tool within an older version like Win8.1 will handle the necessary keys for you.
I just changed everything first, then did a clean install and got the message that my product key isn't valid.
Restart your current Windows version, turn it back on, and then go through the upgrade process once more. That’s what I did, and it functioned properly.