Oh - sorry.
Yes, there's a cylinder in the tree model. I used it to determine a good height of the tree, because the cylinder is 6 units in height, as an avatar is, you know.
Seems I forgot to remove it when uploading.
What happend to you is a general problem; better than importing the whole .blend file is to use "File -> Append or Link" which gives you much more freedom in chosing *which* objects to import from a blend file.
(Sidenote: If you want to import more than one object (or material, mesh, group, ...), there is no need to repeat the process for each object; simply select multiple objects with a right mouse click, and there you go)
Besides that, when you import a blend file, it places copies of most of the stuff in an additional, automatically added scene.
So you should look if there is an additional scene.
Finally, you can use the outliner window to see ALL objects you have - even those switched invisible - using the eye icon (apply/revert visibility in Blender).
Just in case you don't know: The outliner is that what you see on top right hand side of the original Model_00131.blend file (the tree model).
This outliner windows has a search function.
Do you have more than "some few" objects named "Cylinder"?
Sorry again
