Note: RADIUS can only be installed on a 32-bit Windows or Linux platform. When you install the 64-bit version of Authentication Manager software on a supported 64-bit operating system, the installer does not present the RADIUS option. If you want to install RADIUS in this situation, make sure that you use the Authentication Manager DVD or download kit containing the 32-bit installation program. Install RADIUS on a separate 32-bit machine running the same operating system as Authentication Manager.
Interesting, considering that I am already running AM 7.1 64-bit on Windows 2008 R2 and have Radius installed and configured. So now I have to call these buffoons to clarify. So frustrating.