From the games main menu, navigate over to the store tab. If you purchased the deluxe version, there should be 2 further options listed here that will allow you to purchase them and upgrade to a different edition of the game.
If my opinion is worth anything, i wouldn't waste the money on these packs. The game is playable just fine as is. Most of the stuff in the packs just clogs up the invenntory that is already too small to begin with.
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