You downloaded a new version of the program that requires a new license. In order to update your Nero product, press the Menu button and select Check for Updates option. Click Yes and OK to allow Nero ControlCenter to check for updates for your installed product. If it finds only a new version of the program (for example version 9.0) it means that you have the latest updates for your version. Don't allow it to install the new version if you don't have a new serial number.