Discover DJ 1.3.2 wont install on my Mac 10.5.8

Hi Guys, I am trying to install the software on my Mac (i've tried 3 of them) and I am getting the same message on the screen that - "Can't open application Cross discover DJ 1.3.2 because it is not supported on this architecture" I have looked around everywhere and I cannot not figure out a reason why? can any one help, this is for my son's present