League of Legends 3D champion models

I am a 3D animator and video editor, but one of the troubles I have is making 3D character models. There has been multiple Fan 3D animation project I have been trying to work on, but I need champion models from the game. I have tried many ways to get the models, but all have been unsuccessful. There is the site teemo.gg that I could look at all the models (skins included), but there isn't a way to download them, and I don't even know how they got the models. The models that I need right now are; Yuumi and Book, Lux, Sylas, Garen, and Jarvan IV. I will need all the normal champion models eventually, but for now it is just these five. If any one can help me I would be very grateful.