License activation tool is a utility used to install web-activated licenses. Depending on the license type, the following activation tools are available:

StandAloneKey.exe - License activation tool for standalone web-activated licenses. It can be found in the CSiLicensing subfolder in the installation folder for your software product (SAP2000, ETABS, etc.). In addition, a shortcut can be found in the Windows Start menu under the product folder.
NetKey.exe - License activation tool for network web-activated licenses. It can be found in the Sentinel RMS 8.5 Utilities installation folder. In addition, a shortcut can be found in the Windows Start menu under the Sentinel RMS 8.5 Utilities folder.

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