Hey Julian (and Leon, since I never responded on here), I'm sorry to hear about that! Some of the references you're talking about are a carryover from the old site (https://legacy.contextualelectronics.com). In the short term, the best solution I can give you is to create a login on that site. Would that help?
In the longer term I'll be re-recording some of these videos to indeed be more self contained. I'll audit the videos that are on here right now, as it's been a while since i watched these videos and try to rectify any references that are awry.