The magazine comes in two versions, one with a DVD and one with two CDs. The part abut creating a CD image from the DVD only applies to those with the DVD issue. In fact, that was for a JDS image. Knoppix is on the DVD as an ISO image, which you write to a blank CD-R as described on pp115/116. Knoppix was only on the DVD, if you have CDs, you don't have Knoppix.
"Insanity: doing the same thing over and over again and expecting different results." (Albert Einstein)