Hello Hal,
Hope the follwing blog article can help you:
Using the System Center 2012 Unified Installer
http://henkhoogendoorn.blogspot.com/2012/01/new-system-center-2012-unified.html
"System Center 2012 Unified Installer is a utility designed to perform new, clean installations of System Center 2012 for testing and evaluation purposes only. If you want to upgrade from an existing System Center
installation or choose set up options such as high availability or multi-server component installs, please refer instead to the System Center 2012 component installation guides located on the
Microsoft Private Cloud Evaluation Resource Page."
Thanks,
Yog Li
TechNet Community Support
