The problem was that Millard unexpectedly died. This was before, I suspect, he had completely finished the book or completely updated his associated software. The current software is exactly the same as that which I helped him Beta-test some years ago now. You will note that in the book he doesn't actually refer to his proprietary software by brand-name but all the screenshots are derived from it. He also makes the point that everything he's done can be done manually by calculation and free-hand drawing -- and he's quite correct: but you wouldn't walk 100 miles if you could drive would you?
His own software does include a Monte Carlo calculator but its minimum lookahead period is 20 days whereas in the book I think he refers to something around five. (It seems that the software illustrated in the book uses an updated M-Carlo module that has not been incorporated in his published software). There is of course nothing to stop you feeding your data into a Monte Carlo programme and doing your own calculations. The most valuable part of the book refers to the use of cycles and for a full explanation you do need to read his previous book "Tribute to Hurst".
Milliards proprietary software is a little bit buggy -- I think he possibly had a problem with making his arrays too small to hold large data series or the memory allocation was insufficient (but he was a mathematician primarily, not a programmer) -- but it does work well if treated gently and it is the easiest way to find cycles which can be relied on. If you have the time, patience, skill etc etc you could write your own software to calculate the cycles but his method of summing them was proprietary and I suspect, would need some fairly advanced programming and algorithmic skills. In practice its easier to stick with what he produced.
It takes quite a lot of effort, practice and understanding to be successful with Milliards methods but I can assure you that used properly, they are extremely profitable.