need more sources
 

I'm trying to download "invader Zim" episode 3 "walk of doom" and i'v looked under "invader zim" and "walk of doom" but whenever i try to download the episode it says "need more sources" and 2 times i managed to do it it didn't work on realplayer or windows media player... I have like 5 other ones downloaded for realplayer. Please tell me how to get more sources or something.