The free Windows 10 upgrade offer may technically be over, but it isn’t 100% gone. Microsoft still provides a free Windows 10 upgrade to anyone who checks a box saying they use assistive technologies on their computer. This offer will end at some point, but Microsoft hasn’t announced when.
How This Free Upgrade Offer Works
Microsoft has announced that it wants people who use assistive technologies to be able to upgrade to use the new accessibility features in Windows 10’s Anniversary Update. In the Anniversary Update, the Narrator screen reader is improved and new applications like the Edge browser, Cortana, and Mail offer improved accessibility features. Windows users who use assistive technologies (like the narrator, on-screen keyboard, or high contrast desktop theme) may not have wanted to upgrade before these improvements were made.
Read more at: http://www.howtogeek.com/265409/you-can-still-get-windows-10-for-free-from-microsofts-accessibility-site/