Videos for tutorial "First Hour in Unreal" are missing

These tutorials I am working on are excellent, but when I got to Module 4: Build a HUD with Unreal Motion Graphics | Unreal Engine 5.8 Documentation | Epic Developer Community the surround html page for the site loads but the videos are not found when you click on them. Instead there is a text prompt

       NetworkError when attempting to fetch resource.        

          I see no way to reach our to Epic about this, and I am keen to finish the series.  Appreciate any suggestions.