Coming down the main staircase in the building with the common room etc, just go through the door basically directly in front of it, across the yard, and then along the cliff to the right
Followed your instructions and crossed the courtyard,but turning left ends in a drop out of bounds where I can walk up the background mountains ,and taking the path to the right ends in a invisible wall,dont know if I went the wrong way or if that area is just empty due to a bug :/