dragon age origins ultimate edition (How to install?) XBOX 360

Hi everyone. 

I just bought DA:O ultimate edition on Xbox 360. Unfortunately when I put disc 2, on the game main menu it only registers as awakening. When I go to the dlc tab on the menu it brings up all the content, HOWEVER when I click them it wants me to BUY them. I have already bought the ultimate edition and I don't want to have to do it again. Looking at the disc it only says Awakening on it, and not Ultimate Edition. Have I been sold the item with the wrong disc? I bought it second hand because I was told that the dlc was on the disc and there were no codes. 

Ive tried downloading it onto my Xbox (Xbox main menu, game details, install) but the disc only recognises as DA:O, not awakening. 

Am I doing something wrong? Am I missing something? I feel like it shouldn't be this difficult. 

(Picture of the second disc. Is it the right one I've got?)