This option compares the number of devices allowed by your WhatsUp Gold license against the number of devices configured in the application. If you reach the device count limit allowed by your WhatsUp Gold license, you will are not able to add any additional devices to the WhatsUp Gold configuration.
You can either purchase an upgrade to a license with a higher device count limit, or remove un-needed or non-critical devices from your WhatsUp Gold system.
Licensing and support information is available on the WhatsUp Customer Portal. The web portal provides enhanced web-based capabilities to view and manage Ipswitch product licenses.