It is widely repeated that Aleister Crowley failed at the Abramelin ritual. The full story is far more complicated and subtle than that. I shall discuss this in more detail in the book I am currently writing, but the gist of my argument is that Crowley completed the Abramelin ritual numerous times in different modalities. Yes, he did not complete the ceremony in the specific form that Abraham describes, but instead he fulfilled its objective through the use of an alternative ritual (both physically and astrally), through visionary trance work, and through purely psychological techniques.