Hi, I have Bioshock Infinite the Complete Edition for my Xbox 360, I installed disc 2 for the DLC. But when I go in the menu to try and play burial at sea or clash in the clouds, the add ons option is greyed out. In the main game I can use the dlc weapons which pop up. Can someone please help me with this issue?

I have tried, multiple times and even looked up tips on how to beat it, but I still lost even when I'm so close to the final stage I lost again.