There are two possibilities.Firstly: the device does not find the dongle, and it can only be in the demo mode.Secondly: the software has expired and the secret key needs to be renewed. Another possibility is to check the dongle item when installing the software. Before installing, please check whether your system meets the following recommended configuration requirements: Win7 and above operating systems. I3 and above CPU. At least 4Gb RAM. 15-inch or more VGA monitor, resolution 1280*1024 or more, 32-bit true color display is recommended. At least 2 USB ports. If your operating system is based on Vista (including Windows Vista, Windows 7, Windows10)