The FBX-glTF readme asks for version 2015.1 of the FBX SDK, but links to http://www.autodesk.com/products/fbx/overview

The new default is 2016.1. The old 2015.1 version can be found here:
http://usa.autodesk.com/adsk/servlet/pc/item?siteID=123112&id=10775847