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I installed the Broken Steel DLC and it leveled me up in the game and everything worked correctly, however, after I thought I beat the game and watched all the credits, nothing happened.
I finally figured that I hadn't finished the "Take it Back" mission correctly. After I replayed it and went in and CORRECTLY ENTERED THE PURIFIER CODE, then the game ended a little differently and the Broken Steel DLC kicked in and I was able to continue playing the game.
Thought this might help some of you that are having problems.