Looking at the download options of this image after following a few links:

Full Res (For Print), 11694 X 13392, TIF (173.29 MB) 
Full Res (For Display), 11694 X 13392, PNG (152.97 MB) 
1746 X 2000, PNG (4.71 MB) 

Uhhh. I think 4.71 MB ist going to do just fine.