Well since we just spent $1300 or whatever on the Network Professional version, I hope that I'm a customer.

I never got any email with a special download section or anything. I called sales and they set me up with the portal, where I was able to download the license file.
Originally I installed it with a trial license, uninstalled it with the installer script -u option. Frankly I am inclined to just format it and start fresh tonight, as I have a feeling the script didn't really uninstall everything, as it never asked me for the new license file when I reinstalled, it just snagged the updated one I put in the same directory.
Here is the output:
Release 5.0.6_GA_2313.RHEL5_64_20080522130456 CentOS5_64 FOSS edition
I'm assuming FOSS mean Free and Open Source. So is there a special download link for Network Professional versions, besides the main site?