Forum:Plese Help me install DLC's on mac

Hello, I would really appreciate some help. I have 13-inch macbook and the Borderlands game of the year edition. I have also downloaded the Add-on Data which contain the DLC's but I don't know how to run them. I play as Roland in the game, I'm level 30 so far and I would really like to play the additional levels (DLC's). Thak you for your help.