Download issue: don´t use OPEN in the Save dialogue. Use SAVE AS … 
Here you can find some high poly meshes. These Meshes are NOT meant to be used in a 3D game. Too much polys. They are meant for prerendered graphics. Or a still.
High Poly Tree 1 —1.75 Mb — Download
16.9.2010 – Polycount: around 30.000 Quads
High Poly Tree 2 —3.35 Mb — Download
16.9.2010 – Polycount: around 30.000 Quads
High Poly Tree 3 —3.1 Mb — Download
16.9.2010 – Polycount: around 30.000 Quads