Do you actually have to have AT programs on your PC for this or just say you do?
I think you only have to claim that you use AT. For all I know it could include the built-in accessibility settings of Windows itself.
According to https://www.microsoft.com/en-us/accessibility/windows10upgrade all you have to do is say you use AT:
What assistive technologies are eligible for the extension?We are not restricting the upgrade offer to specific assistive technologies. If you use assistive technology on Windows, you are eligible for the upgrade offer.