It's not just broken, it's FUBAR'd and the creator never actually finished the product by assembling all the pieces.
He appears to have used Blender's particle system to create some parts but never converted them to meshes. And beats me why he put the .blend file out there instead of exporting to OBJ or some other file format. And at 80+ MB, the finished product is immensely larger than it needs to be.
I converted and exported the different parts into BLender 2.79B, then mapped them to acacia bark and leaf textures. (no bark texture was included in the original .blend file, and maple leave were used in the original version. I've used actual acacia leaf image in my finished product.