AGK doesn't seem to work with certain gamepads.
Xbox Controller + Cable for Windows
https://www.amazon.com/gp/product/B01LPNKGGI
DualShock 4 Wireless Controller for PlayStation 4 - Jet Black (CUH-ZCT2)
https://www.amazon.com/gp/product/B01LWVX2RG
When using either of these controllers in the bluetooth wireless mode, AppGameKit does not detect them. Both controllers work fine with other applications.
By the way, there is a program that can make the PS4 controller appear as an Xbox360 controller, AppGameKit works with this.
http://ds4windows.com/
I am using Windows 7 Pro 64-bit.