Downloaded Island Living, but no update in game

Hey there!


So... like the title says, I downloaded the new addition to the game, downloaded, made my copy, added to my files. Everything I usually do. However, I open up the game, and nothing! It's still showing Strangerville as my last update and nothing else. I'm so confused. I figure if I had done something completely wrong, the game wouldn't have opened up at all. 

Please help!! I have a mermaid Simself stuck in my head that's dying to be created.