Mass Effect 3 Citadel DLC Downloading Issues

Hello,

The Xbox that I am using to play Mass Effect is owned by my brother for several years. He is an avid gamer and has filled the Hard Drive to capacity. In order to play Mass Effect, I have been using flash drives as the place to store my data.

I downloaded Leviathan to the Hard Drive and was able to play, but Extended Cut and Citadel were set to download to my flash drive after attempts were made to download it to the hard drive with no luck.

Despite the repeated attempts and notifications that Citadel Part 1 has successfully downloaded to the flash drive, it only shows Title Content Progress Cache and the Incomplete logo.

I have tried to convince my brother to delete some of the memory for his games that he doesn't play anymore but he can't seem to budge the 4G that I need for the whole two parts. I would sacrifice the Leviathan DLC for space but I need the War Assets (no multiplayer).

Any advice to be able to download them properly to a flash drive that will then allow me to play the DLC or do I have to beg for gigs on the Hard Drive in order to make it work?

Thank you for your time,

Thumper