I had recently noticed that Fellow Giantbomb user mgssnake has been providing on his blog a giant list of all of the download locations for the endurance run episodes.  However, he's stopped at episode 127.  I will be continuing his work from there and providing links for all of the future Endurance Run episodes.
 
First, let me just re-iterate what he has said: 
These files are in FLV format and they play fine on the latest version of VLC Media Player, as well as FLV Player.
 
Now, for the sake of easy-access, I'm going to re-list all of the file names he's put on his blog here, all credit goes to msgsnake for listing episodes 1-127 and the special edition behind the scenes episode.
I will be adding onto this list as the episodes are released, so check back often! :-D
If any of the links are incorrect, please let me know and I'll fix them as soon as possible.
 

Behind the scenes videos: