https://www.neowin.net/news/psa-free-upgrade-offer-for-windows-10-is-still-available-for-10-more-days
 

Ya that's been going on for a year now. They keep extending it.
I upgraded a HP desktop w7 computer I put a new SSD in and HP wanted $50 for the OS disk. When I went shopping on MS web site I saw that offer. Was pretty easy, Download the ISO image and install, then you do a chat to authorize and the MS tech goes on remote destop pokes around and bingo, It's only the basic version, you can't get the better versions this way. 
I mentioned it here plenty of times but I think people are scared of free stuff for some reason. 

The upgrade is for "users of assistive technologies" but Microsoft isn't verifying that the person actually qualifies.  That has been the "requirement" for a while.

Plus Microsoft has relaxed the activation requirements for Windows 10.  You can install and run it indefinitely without activation now. 
 
https://www.windowscentra...ed-activate-windows-10
https://www.howtogeek.com/244678/you-dont-need-a-product-key-to-install-and-use-windows-10/
 
You are limited to the un-customized desktop settings and a watermark nag shows up in the bottom right corner of the screen, but it will still work.  Great if you just want a second copy of Win 10 on a spare drive to have as a backup, or use as a test system, or for building a new system...