Microsoft has made it clear that free upgrades to Windows 10 will end December 31, giving users about 2 months to make up their minds. The free Windows 10 upgrade technically ended in July last year, but it made one interesting exception: those who used assistive technologies could still upgrade for free beyond that point.
If you use assistive technologies, you can upgrade to Windows 10 at no cost as Microsoft continues our efforts to improve the Windows 10 experience for people who use these technologies. Please take advantage of this offer before it expires on December 31, 2017. With the Windows 10 Anniversary Update, we’ve taken a number of steps to improve the accessibility of Windows 10.