Hey Brian,
Have you got the QuickStartGuide.htm file which should be in the StreetMap Premium folder? There are instructions on how to install the license file in here.
Do you have ArcGIS Desktop installed? If you do, double clicking the .sdlic file should activate the licensing process. Another way to enable a license is to use the ArcGIS Administrator. Run the Start > Programs > ArcGIS > ArcGIS Administrator. Switch to the Data Licenses folder in here and choose Add a license... Browse to the .sdlic file you've copied to the disk.
Let us know how it goes.