Supposedly it is to be a free upgrade for Windows 7 and 8 users.
I am running APL\1130 on an old 1973 IBM 1130 minicomputer and it’s fine.
Here is an article on it. I have Windows 7 home premium, so I should be able to get it free - though I’ve had this computer since 2011.
http://news.yahoo.com/windows-10-won-t-free-might-hoped-163531271.html;_ylt=AwrBT6P75c9UMMQAlT5XNyoA