I won them, I have REALLY worked through 2 of the easier chapters, they were just relevant for my work. It was hard, pencil, paper and I didn’t even comprehend math the way most people here do . They should be still around, but an the other hand, in 2001, when I purchased them, the stuff was not all over stackoverflow where a lot of these things are explained, a bit more comprehensible. 
Funny thing, that now that I picked up some of the “math reading skills” needed for that form of abstraction (doing machine learning and just getting over it with that notation) I rarely use it. Maybe others picked up where he left off. Example: These animations of sort algos.