DLC not working

[njdevils17]

I downloaded the bare knuckles mode a few weeks ago at home. It was working fine at my house on my Xbox. But when I went back to school (not my Xbox at school but I'm using the same hard drive that I downloaded the DLC with) it wouldn't work. I've never had this problem with DLC for other games, so long as I was signed into Xbox Live.

Anyone else have this problem? And when I go to re-download the mode, it still doesn't work.