Have you been delaying your Windows 10 upgrade because your assistive technology (AT) has not caught up with the future? Then take a deep breath and relax. According to Microsoft, even if you missed the July 29, 2016 deadline AND you use assistive technology, you can still upgrade. Once you are ready, you can go to the Microsoft website and click Upgrade Now.
How long will this extension be available? There is no specific date on the Microsoft website as to how long this free upgrade will be available. That said, if you want the upgrade, I would recommend that you upgrade as soon as your AT is ready.