Production Plus Pack and Macs

I'm trying to install the Production Plus Pack that came with my UA 4FX on my Mac. After clicking on the install button on the CD, I get the message (not verbatim) "This is not a PC processor and can't be installed".  I know Sonar LE doesn't run on a Mac, but the others (Rapture LE, Studio Instruments Drums, Cakewalk Sound Center) are suppose to work on a Mac as this is advertised on the box, many retailer websites, Roland and Cakewalk websites, but I can't even attempt to do a custom install. My specs are a Power Mac G4, OSX 10.5, PowerPC 887mhz processor, 1.5G RAM—all of which match the specs listed on the box, etc. Anyone else have this problem or have a solution?  I've already contacted Tech support who weren't very helpful.  Told me to install Bootcamp.  I don't have enough hardrive space for that or the right processor (Intel).
Thanks!