I have an Xsi/450D and a 60D. I have two cds of software that came with the cameras. These are the white EOS Digital Solution Disks. One is version 18.1 and one is version 23.0. I assume the 18.1 version is the one that came with the Xsi/450D and the 23.0 is the one that came with the 60D. Am I right?