To Install software to Red Hat 5 Enterprise Linux when your installation is not registered with Red Hat Network, simple solution is to install the software from the installation DVD.

If you have an ISO file of the installed OS version, mount it to /mnt/cd

Then create a file “iso.repo” in /etc/yum.repos.d

[base]
name=DVDROM
baseurl=file:///mnt/cd/Server
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release