Thank you for playing! Do you have the button on the main menu that says "DLC"? You can click that see if the DLC is noted as unlocked by the game. If it says it's not unlocked maybe there's something wrong with where it is. Or if it is unlocked, maybe you didn't meet the requirements. The Wedding DLC doesn't happen if you or Cove never proposed. It can be in Step 3, in between Step 3 and 4, or during Step 4 but the two had to officially get engaged somehow at some point before the Wedding DLC.