Derek,

The reason why it is not working is because, when doing rpm installations from the command line, you need to specify the location of the rpm you want to install (since Fedora is not magically endowed to know where it might be. )
So, if I wanted to install an rpm that is on a cd, under the folder fedora, I'd do something like

rpm -ivh /mnt/cdrom/fedora/mydesiredrpm.rpm

(of course, I'd need to mount the cd first.)

I think the same applies to the graphical installation. If you want to install a specific rpm, you need to have the proper cd on the cd drive.