Package dependencies

I’m new to Linux and have been running RH9 for a few weeks.Having gained confidence, I decided to install some of the additional packages from the CD only to be met with errors to the effect that the install was dependent on certain packages being present. Using rpm -q I can see that later versions of the required packages are installed. I’ve tried manually installing the packages with the –nodeps switch but receive errors to the effect that the new package conflicts with the old. How can I install additional packages from the CD?