Your upgrade CD should have come with an installation guide. There's a chapter in there called "Upgrading hardware and software" that details the steps necessary. The only tricky part is removing the Dialoigc TAPI/WAV drivers prior to upgrade (assuming you're using Dialogic).
If you don't have a guide for some reason, CD 1 has a directory called "documentation" off the root. It has the install guide in PDF format on there. There should also be an Adobe Acrobat install on there in case you need it.
if there's something in the doc you're having trouble with, let me know.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.