Download and install ConvertXtoDVD (see Resources) and you will be prompted to input your key code to activate the software.
Run your keygen and a key will automatically be created. Highlight the created key and right-click it. Click "Copy" from the small menu that appears.
Right-click the "Key Code" field and click "Paste" from the small menu that appears. The key will be copied into the ConvertXtoDVD program.
Click "Activate" to activate the software, and receive updates that you already paid for.