when i installed rct3 onto my new PC i ended up getting odd textures where invisible paths and  walls are raised above the ground, i dont know how it happened as it is the same path set i have on my laptop. 

There are visible paths with the set. I've seen those textures with the visible paths in that set. Make sure you don't have the visible folder installed. If you do, I would take it out and only install the invisible paths. I hope that makes sense.