(WOTLK related)

Hello, i found this thread ----> http://forum.warmane.com/showthread.php?t=367711 <------- and saw that amazing Tree of Life form that guy wrote about (i tried to PM him but he is not responding) so i want to ask you how do i achieve to have same model for my Tree of Life form on WOTLK please? I was doing some research but i cant find a way to get just this model and how to edit tree of life form.

THANK YOU!