This video was created by a third-party firm (UnCanny Owl) and includes steps for configuring a premium WordPress theme. This theme is NOT required in order to use LearnDash. You can read more about this specific theme here.
Also, this demonstration includes set-up instructions for optional plugins. These plugins are not required in order to create (and sell) LearnDash courses.
Please do not hesitate to contact us if you have any questions.