Stop the Service (instructions for Windows 10; others differ)
Right-click on the Server’s Start command and choose Computer Management.
In the list that appears, double-click Services and Applications.
In the list that appears, scroll to ExtendSimServer.
Stop the ExtendSimLicServer service (right-click select Stop).
Close the Computer Management window.
Remove the Service
Open the Windows Command Prompt as Administrator. (On most Windows systems, enter CMD in the Search box and simultaneously click Ctrl+Shift+Enter to open a command window.)
Click Yes in the User Account Control window to enable the Windows Command Processor.
At the command line enter SC delete ExtendSimLicServer and press the Enter key.
You should receive a SUCCESS notification indicating the Service has been removed. Close the Command Processor window.
Uninstall the ExtendSim Floating License Manager using Windows Settings > Apps > Apps and features. Then, delete the folder ExtendSimFloatingLicenseServer (located by default at the root of the C drive).
Note: Before reinstalling using a newer ExtendSim Server License Manager, you must first uninstall the previous License Manager as described above.