Hi britjet
In order to tackle the CTDs I suggest check the following points:
1. What installation do you have? Steam or MSFS store? Which path is the community folder? Is it the default path?
2. Could it be that other addons interfere with the Kai Tak scenery?
3. Do you have a chance to try only with the two folders
"modelinstruments-airport-vhhx-kai-tak" and
"modelinstruments-airport-vhhx-kai-tak-imagery" inside the MSFS community
folder?
4. Did you have frequent CTDs also before installing Kai Tak scenery?