Last I looked at a Coursera course, there are explicit download buttons as well. It's not hard to save the course materials while the course is ongoing, the pro

Last I looked at a Coursera course, there are explicit download buttons as well. It's not hard to save the course materials while the course is ongoing, the problem is that the materials are unavailable after the course finishes. You're not always going to know what will or will not be important in the future.