Textures might be missing.
Do you mean the .blp files? I checked and none are missing
I converted a Cataclysm model (Chromatic Dragon) and that is green also
When a model is green, it means that inst loading the blps.
Make sure that the blps are in the correct path. In the m2 file you should see the path of the textures that the model use and make sure that u have all those blps in the correct path.
Also, if the model loads the textures path by dbc, you should add in the model dbc those textures.