Is there a way to limit what videos/exercises are accessible by a certain user group or is there a way to disable activities for sections that I have not downloaded the videos from showing up?
Those features you’re describing aren’t available in KA Lite. But they are excellent features to consider, especially if your different user groups have vastly different subsets of content to work through. I’m passing this along to our dev team who are actively developing Kolibri right now. Thanks!