Hi Bill, 1 - Content is not duplicated, just new versions of the bootstrap framework. We recommend coming going from the oldest one to the new one; 2 - In regard to downloadable content, these are for very old videos, which usually are no longer relevant. The new ones are streamed directly from the site with a player. So from 2010 to now you can find all of them from the home page if you just scroll down, be the year. Sincerely, Andy |