You may still be able to upgrade for free if you have Windows 7. Not the assistive technologies bit, but the other section entitled 'Provide a Windows 7,8 or 8.1 key' says you can still upgrade by downloading the installation media and using your Windows 7 key
All the Ways You Can Still Get Windows 10 for Free
It says:
While you can no longer use the “Get Windows 10” tool to upgrade from within Windows 7, 8, or 8.1, it is still possible to download Windows 10 installation media from Microsoft and then provide a Windows 7, 8, or 8.1 key when you install it.
Windows will contact Microsoft’s activation servers and confirm the key to the previous version of Windows is real. If it is, Windows 10 will be installed and activated on your PC. Your PC acquires a “digital license” and you can continue using and reinstalling Windows 10 on it in the future.