It used to be fairly simple to connect these on the same PC. In Sky Demon it was Go Flying - Connect X-Plane.
In pre-10.45 X-Plane there was an option in Settings to output data to a PC.
Not any more.

Something has happened between the new versions of both programs so that I cannot make the connection any more.

I'd be grateful for advice on how to fix this.
 
Thanks! 

I've just switched from FSX to X-Plane 11, use Skydemon on an iPad Mini with it. Can connect it all up no problem and navigation is working - but I wondered if anyone knew of a plugin for XPlane that can fake ADS-B transmission to send positions of other Vatsim aircraft to Skydemon?