Microsoft ended the free upgrade period for Windows 7, 8, and 8.1 users to migrate to the Windows 10 platform in the middle of last year. But it seems that the company still wants those older OS users to come aboard the Windows 10 train as it has failed to block a simple upgrading method during installation of the Windows Creator's Update. When prompted for a license key during the installation of a fresh Windows 10 install; enter an older Windows 7, 8, or 8.1 license key. The key will be upgraded to Windows 10 at that time! This method worked with the Anniversary Update also, but may get canned in the future. This would be of particular interest to those that are interested in finally upgrading to Windows 10 to make full use of their new Intel Kaby Lake and AMD Ryzen processors without patching that silly Microsoft Windows Update block that was introduced this week. Here is a link to the official Windows 10 ISO direct from Microsoft.
License keys for Windows 7, 8, and 8.1 can be used to activate a fresh copy of the Windows 10 Creators Update, even if Microsoft has "officially" stopped offering free upgrades to Windows 10 back in the summer of 2016. This means that users who want to update from Windows 7, 8, and 8.1 to the latest Windows 10 version don't need to buy new license keys to activate their new Windows OS. All they have to do is install a fresh copy of the Windows 10 Creators Update, enter their old license key, and enjoy their new OS.