Master Version XML file 404

The Adobe Flash Player Administration Guide for Flash Player 23 (Last updated 9/8/2016) references the Master Version XML file. However the HTTPS URI redirects to HTTP and the resource is not found.

When will this resource be active?

Thank you.

$ curl -IL https://fpdownload.macromedia.com/pub/flash-player/masterversion/masterversion.xml
HTTP/1.1 302 Moved Temporarily
Server: Apache
Location: http://download.macromedia.com/pub/flash-player/masterversion/masterversion.xml
Content-Type: text/html; charset=iso-8859-1
Content-Length: 0
Date: Tue, 13 Sep 2016 12:49:14 GMT
Connection: keep-alive

HTTP/1.1 404 Not Found
Server: Apache
Content-Type: text/html; charset=iso-8859-1
Content-Length: 0
Date: Tue, 13 Sep 2016 12:49:14 GMT
Connection: keep-alive