It may sound stupid but you are unziping the files arnt you? and putting them in your style/themed folder complete I.e not unziping the contents of the folders into the style/themed folder. Here heres what I mean.
OK lets start:
Step One:
Go to start/mycomputer.....
Step Two:
Now go to the Drive that RCT is installed on, In my case its D but it most peaples cases its C......
Step Three:
Go to program files.....
Step Four:
Go to Atari ( This is your RCT game folder).....
Step Five:
Go to the styles folder.....
Step Six:
Go to the themed folder.....
Your Style/Themed folder should contain the full custom sceanery folder as shown below. When you are Unziping/Estracting the custom sceanery into the Styles/Themed folder you do the whole folder intacted. I hope that makes sense lol
Heres what I mean.....
Normaly what I do is Download the sceanery, And than unzip/exstarct it to my desktop and than copy and paste the whole folder into my Styles/Themed folder. That way you know its being put in the right place.
I use WinAce for Unziping/Exstracting which can be found
here:
Hope this helps
shaun