A. Launch the Software Authorization Wizard (Start > Run > 'C:\Program Files\ArcGIS\License10.0\bin\SoftwareAuthorizationLS.exe').
B. Choose 'I need to authorize licenses on my License Server,' '... ArcGIS Desktop,' or '... ArcGIS Engine.'
C. Choose 'Authorize at Esri's Website...'
For more information go to Offline Authorization.
D. At the Authorization Information step, enter only the following values:
First Name: N
Last Name: N
Zip/Postal Code: N
Location: United States
Phone Number: N
E. At the Authorization Information (continued) step, enter only the following values:
Your Organization: U.S. Federal Government/Tribes
Your Industry: Other
F. Choose "Save..." to save the authorize.txt file.