Yes very possible and no, this is not the assistive technologies trick. If you are still running Windows 7 or 8.1 and would like to migrate to Windows 10 for free, that is possible. You can simply use the the Media Creation Tool. This is a free application Microsoft offers to create a Windows 10 installation medium such as an USB stick or DVD.
Ed Bott (Microsoft aficionado) spotted that the tool is offered for download on the Microsoft website and confirmed with several computers that you can upgrade for free saving you a $119 license fee for Windows 10 Home or $199 for Windows 10 Pro.
The Media Creation Tool links the current Windows license to the computer, based on the hardware components. After the installation the operating system will activate based on that license. For Microsoft it would be extremely easy to block Windows 7 and Windows 8.1 licenses but the company simply hasn't done so.
As you guys know, it also is still possible to upgrade throught he ‘assistive technology’ trick. However Microsoft announced that page will be removed and users requiring assistive technology will need to contact Microsoft in person.