You should be able to do the FC3 install on a FC4 machine, at least I was eventually able to get that to work the other day. Make sure that you have shutdown mysql and that it is not running before you try the install. And it wouldn't hurt to shutdown sendmail too, but I don't think that should matter.
Before installing you might also want to shut off selinux too by editing the /etc/sysconfig/selinux file and setting "SELINUX=permissive". Then reboot.
Good luck,
Sean |