Create a custom seekbar with a web object in Storyline. Only works for HTML5, not Flash. Download their widget for free and use it as a web object on any slide where you need a seekbar. Note: it’s free, but you have to share the post on social media in order to download it.
This is geared toward individual experts or consultants who want to launch their own self-service courses. For most of this audience, they don’t even want to self-host with LearnDash (although he mentions that too). I am periodically contacted by people who fit this audience and don’t have the resources to hire an instructional designer. This might be a helpful article for that audience.