You mean the '92 performance at Glastonbury? As far as I'm aware, a recording of the full 12 hours has never been leaked - just the hour and a half excerpt.
Discussion about the video excerpt:
https://www.borndirty.org/forums/showthread.php?t=18210
Discussion about the 1.5 hour audio:
https://www.borndirty.org/forums/showthread.php?t=17847
I never got my hands on a .wav of the excerpt, just the vbr mp3 as mentioned in the thread above.