I'm getting a couple scripting errors on step 4 and the wedding dlc, is there a gb patch in the works?
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I'm afraid I'd need more info to give any concrete advice. But it's possible you're using a save file that's too old to work with the current version or some part of your game isn't fully updated (the base version of the game and/or the wedding DLC file). Those are usually the causes of problems in the wedding DLC.