Hi!
I'm an experienced SketchUp user, currently using version 8 Pro. I'm ready to help you with your project, as I have a strong background in 3D modeling, including SketchUp.
However, I have to be honest and tell you that the result will look slightly different.
SketchUp uses planar faces to imitate vegetation. I can easily extract the texture from the .3ds file and provide it to you, but you must be aware that the SketchUp model will not be the same as your purchased .3ds file.
On the other hand, I will give my best to get the best result for you.