You can't open the application install because PowerPC applications are no longer supported?

I have just recently got a textbook for one of my collge courses and it came with a CD to use for tutoring and exercises. When I inserted the CD a box came up, as if it was ready for me to install, but there is a Slash through Install. I clicked on it and it gave me the message above. I need to use this CD for my Class, someone please help!