I recently purchased this, after downloading I was able to see our moms anniversary, but after that the game ends and don't get the actual wedding bit.
Sorry about that! Hopefully I can help. In order to get the Wedding DLC to trigger, you need to be engaged to Cove BEFORE the end of the last Step 4 Moment, then it will start automatically. Maybe the save you were using wasn't engaged. See if that solves the issue!
