In 1997 or 1998 (probably 1998) I bought two mail order courses for $199. The first from Ken Roberts and the second from Larry Williams. Both were sold through a foldover pamphlet booklet that found it's way into your mailbox box from a list purchased from a broker you may have signed up with. The actual "book" that you bought as a "course" was the exact same shape and size in either case. Except Roberts may have thrown in a few cassette tapes. Larry threw in about three months of his hotline. I remember calling that line on the daily where he scanned the futures markets for patterns.
Pound for pound I felt Larry was trying harder to cram his course more full of useful information. Seasonals, the COT report, advance decline line, a relative strength line marked off by trend lines, the Kelly formula and about 20 of his personal patterns like the "Oops". Also his own indicator the Williams R%. But not by itself. He advised using it in harmony with a larger trend as indicated by a moving average, such that you are selling rallies in a bear trend, for example.
What was impressive about his own personal patterns, most of which applied to the SP500, were the statistics he published for each one, so you could believe the stats or not. Apparently he had hired a programmer that worked with some software and a ton of data to gather it together. That software started selling for a couple thousand dollars or more and was eventually purchased by Tradestation for which you would pay them maybe $100 a year if you also had an account. Now it's free as 'Easy Language" if you have an account.
One thing he said included in his course was a schedule of probabilities which, if I remember, starts with a coin flip probability, your first chance of a win is 50% , and for each loss the probability of the next to be a winner goes up to 67% or something, on up to 92% after four or five losses. But I think most people in gambling forums will tell you this is a fallacy. I concluded that Larry had made a mistake and that this kind of probability escalation only works if you have a positive expectancy to begin with.
He also mentioned that if you don't have an edge the best way to bet is to go all in on one bet, rather than trying to win over many bets...which, imo, has no place in a futures trading "course" where you are especially in grave need of establishing an edge of sorts.
So I guess I'm not surprised to learn he did lose a significant amount of client money . Nowadays you can get more, and more valuable info on YouTube for free.
Out of curiosity I took Tradingview back to 1987 SP500 daily chart to compare Williams contest performance that year to my own method applied to the SP500 daily. ( Btw, there was a big sudden dip that year that caught a lot of traders off guard. In a recent interview I heard Larry mention that 1987 drop had caught him on safari in Africa. He had to scramble to salvage his positions. ) Anyway I was happy to see my own method of being always in, either long or short, outperformed Larry's, with smaller drawdowns, given about 10x or so leverage.