Scenery except Airports, are BLACK

Hi, I have installed the Changi Airport payware scenery by Samsoft on FSX (I think it's meant for FS9 but I assumed FSX is fine), and to my horror, the ground is all BLACK (outside airports). No other buildings, trees, roads (other than water) - no. Everything is just black. And everytime I re-install i get an error around 97%

Ideas? 😞