U.S. National Grid Tools for ArcGIS requires ArcView, ArcEditor, or ArcInfo 9.1, 9.2, or 9.3.
System requirements are determined by the current product version and platform configuration you are using. Please refer to the ArcGIS for Desktop specifications for details.
Microsoft .NET Framework Version 1.1 and the Esri .NET Support Feature for ArcGIS are required to successfully install U.S. National Grid Tools for ArcGIS. See the .NET requirements for more information.