The videos with the scientific content do not change from year to year (every year just a few of them are updated/improved). What does change every year is the feedback webinar for every week. It depends on the questions the students of that year have submitted. You can find them on Youtube (when I forgot to make them hidden ;-)), but the real place to access them is at this course site: you’ll find the feedback webinar of every module as the last item of each module, usually within 24 hours after the webinar took place. (You can also watch live, if your schedule and time zone allow for it).