Most heroes are just from the game, I think they just recolored, re-skinned, others, they used the model of other units.
You cant download 5 mb ?I dont play Dota.
I know What Model he MEAN!THE PHANTOM LANCER/LANCA!Searched his name. Most of the models are special effects, missilies, stuff for spells, etc.
No dota models.
Use MPQ editor to browse through Dota map. Then just extract the models you want.