When you download a game from the Epic Games Store that contains downloadable content (DLC) all of the content is usually downloaded during the initial download. However, given the large size of ARK: Survival Evolved, the DLC that’s included with the game needs to be downloaded separately. 

Once Ark: Survival Evolved has finished downloading, follow these steps to download the DLC:

  1. Open the Epic Games Launcher.
  2. Go to your Library.
  3. Locate ARK: Survival Evolved and click the three dots next to the title.
  4. Click Manage DLC.

  5. To install the DLC, move the slider to the right for each one you'd like to install.

If you don't have enough disc space, you'll receive an error message letting you know how much space you need to free up to download the DLC.

For steps on how to free up hard drive space, see this article.