License keys for Windows 7, 8, and 8.1 can be used to activate a new copy of Windows 10 Creators Update, even though Microsoft has "officially" stopped the free upgrade for Windows 10 since the summer of 2016.
This means that users who want to update their operating system from Windows 7, 8, and 8.1 to the latest version of Windows 10 do not need to purchase a new license key to activate the new Windows OS, nor do you need to have upgraded your old Windows before the summer of 2016.
All you have to do is install a fresh copy of Windows 10 Creators update and enter your old Windows 7, 8 or 8.1 license key and enjoy your new operating system.
For information, when Microsoft launched Windows 10, it allowed users of older versions of Windows a one-year grace period where you could upgrade to Windows 10 for free. At the end of that period, users found that Microsoft had not disabled this feature, and that they were still able to perform a clean install of Windows 10 using the license keys of the previous versions.
Microsoft, in essence, never blocked the upgrade mechanism and it has remained that way even now with the arrival of the new version of Windows.
But that doesn't mean that this solution is legal to get Windows 10, nor does it mean that Microsoft won't block or cause you problems in the future.
