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How do I upgrade a REDHAT E4 WS install - to ES?

I have 15 machines that I just licensed for Redhat ES.  Unfortunately the up2date program does not work for them because  they are all running WS.
Tech Support told me a (non supported) way to take care of this would be to install the ES package.  How do I do this?  Which package do I download?  Can you point me to it?
Then I run rpm -e redhat release ?

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1 Solution
If you have RHEL ES CDs, the find the file
/mnt/cdrom/RedHat/RPMS/redhat-release-3ES-x.x.x.i386.rpm   (x.x.x is the package version number)

Then run
rpm -Uvh /mnt/cdrom/RedHat/RPMS/redhat-release-*ES-*.i386.rpm
reboot your machine.

After reboot, do
cat /etc/redhat-release
cat /var/lib/supportinfo

To see if it gives you the information like ES...
Then run "up2date --register" and "up2date" again.
Or other simple way is copy all files on RHEL ES CDs on the NFS share system.
Then cd to the all the rpm file directory and run

rpm -Fvh /path-to-all-rpm-files/*.rpm

Before you do that, make sure your ES version is newer than the your existing WS.
So download RHEL ES 3.0 Update 7 or RHEL ES 4 Update 3 CD ISO files from http://rhn.redhat.com/ first.
Then covert those ISO files into CD (burning it).

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