This DLC includes some generic animated video maps, still battle grids, and a modular dungeon tile set of 2D assets and various particle effects and weather effects that you can apply to the built-in or your own or third-party maps. 

This package is available for free download with the main application.

If you are struggling with the performance and loading times, launch the software without the built-in assets. To do this, go to your Steam library, and find Dynamic Dungeons Editor. Click on the small cog icon on the right (Manage) and click on Properties. Deselect the Default Assets under DLC and restart the app.