Feel free to watch these videos online : they are offered as playlists at the Sanatan Society website so that you can watch a series of clips on a certain subject in the logical order of the original class - click the following links :

Jnana : The Yoga of Truth (playlist of 6 video's)

The technique of Jnana Yoga (playlist of 5 video's)

The layers of consciousness or Koshas (playlist of 9 video's)

Karma, Dharma & Reincarnation (playlist of 4 video's)

Meditation technique : Listening to the Sound of Silence (playlist of 6 videos)

The Yoga of Happiness or Rasa Sadhana (playlist of 22 video's)