First open your application then click on "Help&Settings" Tab, now click on "Activate license" button, After clic this button your appplication connect with our license server so be sure your internet is connected. When will you use Deactivate license ? When you will uninstall your application for any reson like format your PC or som unwanted reson then first you must deactivate your licens by click deactivate your license either next time when you will install your application agin then you will unabel to activate your license.