How do I install older programs located on older ISO distros?

Linux distro: SLES 11 SP4 I have on hand SLES 11 ISO's: SP1, SP2, & SP3 I need to locate and install older programs located on older ISO's. For example: I have gcc 4.7 on SP4, but I need to install gcc 4.3.4 on SP1. When I insert the disc(s) into the DVD-ROM, I open YaST > Software Management > Search: gcc > The only thing I see is the SP4 catologue list, but I'm fairly certain that the gcc versions are located on those ISO's. What am I doing wrong and how can I install older programs from previous SP packages?