I thought the DLC was in-app purchased

But when I started the game it didn’t show any of the DLC that was said to have in-app, instead I have the standard game with just the four Vault Hunters and the main campaign. Now the game is working very well in my MacPro but I’m a little confused as to why the DLC is not included. If this is a problem then please tell what I have to do to get the full package of the game AND NOT JUST THE STANDARD GAME. Then maybe I’ll rate this a bit hire and enjoy the game a lot more. Thank you.

Edit: Okay I found the problem, but it tells me that I have to pucrchase the DLC in-app, as in it wasn’t what I was thinking and now I feel like and idiot.

[Gonzo_73] about Borderlands 2