If when launching the installer for the ExtendSim License Manager you see the Modify, repair, or remove the program window, it means you already have an instance of the License Manager installed on your Server.

Continuing with the installer beyond this window, will give you the StartService: StartService failed error message.

To resolve this, click Cancel in the Modify, repair... window.

Browse to your original installation of the ExtendSim License Manager (by default, the folder is located directly on your C drive).