You could : 1. Buy a pro licence or : 2. Install a windows 10 pro version and activate with a KMS tool or : 3. Install Windows 8.1 pro, activate it with a KMS tool and upgrade to Windows 10 Pro TH2 (aka 1511) to get a HWID.
Yes. Assistive Technologies is not a Windows version. Assistive Technologies are adapted devices for people with disabilities. Special keyboards, mouse controllers etc.
It's not a windows edition, it's an upgrade tool for people who need assistive technology, it's not needed, normal iso upgrade works just fine.
Although it installs the same Windows, for people who needs assistive technology and for people who doesn't. Aaaaand it's still valid too: "We have not announced an end date of the upgrade offer for customers using assistive technology. We will make a public announcement prior to ending the offer." Choose your path, both lead you to a free Windows upgrade.
All upgrades from 7 SP1 > 10 (home/pro) still work for getting a free HWID (15063 ISO/MCT+Upgrade Assistent+Assistive Upgrade Tool, when updated), only from 8.1 KMS > 10 you need to use 10586 iso to get a free HWID.