They work for me on RH9.
Open a console, change your dir and type something like this: rpm -ivh fpc-1.9.3-040529.i386.rpm
For uninstallation type: rpm -e fpc-1.9.3-040529
or use mc (MidnightCommander) it's like nc for DOS, browse for files press ENTER and you're inside the .rpm Package, now you can chose INSTALL or UPGRADE as well as see the Package contents.
I think your second package is BAD.
DO NOT INSTALL FROM KDE, GNOME OR OTHER DESKTOP MANAGER DIRECTLY, USE A CONSOLE !!!