Hi Peter.
I had this problem but here is how i do it.
Place all the files in the "addon scenery folder in your fs2002 directory.
Then open up FS and go to settings, then scenery libary, and then add area. Click on this and then find the area you are looking for.
Click add area and then restart FS.
I would asume that is right but correct me if i am wrong. I am 85% sure.