Hey Samzilla, so sorry to hear that! We'll need a little more info to help see what the issue is:
Do you get an error message of some sort, or does it simply not show up when you start the game? It would be under the Extras menu on the title screen.
Make sure you have the most recent version of the base game installed too; if you installed it a long time ago, please try reinstalling it.
If these don't work, please email us at melanie at vnstudioelan.com, and we'll try and get you sorted.