For this step, we'll step out of the Unreal Engine Editor and will focus on Epic Games Launcher. Open Epic Games Launcher and navigate to the Unreal Engine section along the left-hand side of the window, and then to the Marketplace tab on the top. Search for animation starter pack and click on the image of the pack with the Free label to open the asset page:

Next, click on the yellow Free button. After a moment, the button should turn into a yellow Add to project button. Click on this button and select the project you have been using to build your game. A folder called AnimStarterPack will be added to the Content folder of your project.