I did offline install for JFK v 2, and kiah. JFK installed fine but kiah did not. It worked for a few minutes, activated it, it shows up in scenery library, and both adding manager and couatl are in the top menu. I reloaded the airport and the textures went to beyond default. No runway numbers, light gray runway, blurry ground, flat buildings, and canyons around the terminal. I reinstalled but issue still happened. I will try again to reinstall.
I can and only did offline install, I can get pictures if needed or error logs, just give me instructions how.