That doesn't sound so good. So here is a list:
-license should not be a question since push notice works with and without license.
-how many cams do you have license for?
-when you connect with the NCS App to NCS the first time you get a question about enabling push notification.
-check the Rule Manager so that PushNotifications is enabled.
-if nothing of the above works do a clean installation of NCS. First use the installation program and Remove NCS. Then go to C:\ProgramData\Moonware and delete the folder for Netcam Studio. Then go to C:\Program Files and delete the folder for Netcam Studio.
-install NCS again.
-connect to NCS with the APP and you should get the question about enable Push notifications.
-when it works do the license process.