Hi Andy! The map is part of the base game, not the addons used for second half content. You cannot add a module to an existing game, only addons. The typical process to add it to an existing game is to create a base game for Waterdeep: Dragon Heist and use the Transmogrifier to move the map page into your existing game. Since you are on a plus account, this may prove to be difficult. Transmogrifier and Mod script automation are the two main reasons for using a Pro account. Moving a page like this on a Plus account can be done, but it's a laborious matter of downloading and re-uploading art pieces. It's probably worth your time to upgrade for a month than to go through that. The biggest danger is that you will start using the Transmogrifier and Mod scripts, see how cool and useful they are and not be willing to go back. I've looked on the marketplace and there is a map addon for Mad Mage, but not Dragonheist. The maps for the former were far more complicated, which is why they were likely given this treatment. All that being said, if you just want a map of Waterdeep on a page, and aren't concerned with the Roll20 enhancements (efficient slicing into sub graphics for better loading, labels broken out onto GM layer, scale properly configured), you can probably find a reasonable image through a google image search.