Well you can find versions on github (that's how I realized it was incompatible, instead of me being incompetent) but it's not terribly great pedagogy to have a

Well you can find versions on github (that's how I realized it was incompatible, instead of me being incompetent) but it's not terribly great pedagogy to have a text book explaining things piece meal and then having to sort of eyeball some one else's full source code and try to guess which bits are necessary changes and which are that persons idiosyncrasies.