If you upgrade the license to more sources or for any other reason need to change license number do the following:
1.stop Netcam Studio.
2.go to C:\ProgramData\Moonware\Netcam Studio\Server. The folder ProgramData is a hidden folder so you might need to make it visible from the Control panel.
3.delete the file Lic.dat
4.start Netcam Studio X, blue icon, and in the menu click on the key icon and enter the new license number.