Hi Taz! Those products are not meant to be used in tandem. The map pack and card addon is if you want to run your own game idea, but use maps from DotMM. The base game already has everything from the Addon. As you have discovered, the addon will overwrite identical pages in the module, replacing them with unpopulated ones. If you purchased the addon in error, you can file a Help Center Request and request a refund. From the Marketplace Description of the addon: Important Notice: The Waterdeep: Dungeon of the Mad Mage - Map & Card Deck Addon is not designed to be added into the core Dungeon of the Mad Mage adventure module, as these elements already exist within the module. Attempting to import them into the core module will result in your current maps being overwritten by the addon's maps. and Note: This product only contains the maps and decks from Waterdeep: Dungeon of the Mad Mage , and does not include tokens, book contents, notes, art handouts, or any other element. All of the contents of the Map & Card Deck Addon are available in the complete Waterdeep: Dungeon of the Mad Mage bundl