These are digitized recordings of the 1996 Doctrinal Conferences by Bishop Williamson, held at St Thomas Aquinas Seminary in Winona, MN.
An ex-seminarian was kind enough to preserve the content of these VHS tapes for us, and for posterity.
Session 1 & 2 (https://www.youtube.com/watch?v=qNGTXhEhbVg)
Session 3 - From Christ to Antichrist, Part A (https://www.youtube.com/watch?v=9Wpupj76io8)
Session 4 - From Christ to Antichrist, Part B (https://www.youtube.com/watch?v=L02doxGvfxg)
Session 5 - Influence of Fɾҽҽmαsσɳɾყ (https://www.youtube.com/watch?v=39qAYCswApk&feature=youtu.be)
Session 7 - Question and Answer Period (https://www.youtube.com/watch?v=VLcYMGXdh5Q)
Session 8 & 9 - A Catholic View of Liberty (https://www.youtube.com/watch?v=U_50C4J08KI)
Session 10 - A Catholic View of Liberty (https://www.youtube.com/watch?v=J_JєωNIHBJA&feature=youtu.be)
I like the random youtube ID given to the last conference: J_JєωNIHBJA