Try to run Live Update now, it should download the support files needed by JFK V1.
I strongly suggest to update to JFK V2: there's a big alert on the JFK web page which clearly says JFK V1 should be used mostly in FS9 and, for FSX or P3D, we suggest to use JFK V2 instead.
The upgrade price from JFK V1 to V2 is quite low, and it's more or less the same as the price difference between the two so, there's really little reason to use an 8-years old scenery.
