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When installing and starting the ArcGIS License Manager, the following error may display:
"Unable to communicate with the Sentinel SuperPro key".
The Sentinel SuperPro driver that is required for the hardware key is not recognized by ESRI software applications installed on a 64-bit operating system, such as Windows XP Professional x64 Edition.
This issue has now been resolved with updated Sentinel drivers and a new License Manager setup. More information on the resolution as well as a patch for the issue can be found by way of the following link:
ArcGIS Desktop 9.x License Manager Patch