I see in your order history that you have purchased Design Extender, Power CMS Builder and Power CMS 2, make sure you are using the serial number for the product you are using.
If you installed the CMS to your site using Design Extender, use the Design Extender serial number.
if you installed the CMS Package to your site using Power CMS Builder, use the PCMS Builder serial.
If you manually installed the CMS PAckage using the Power CMS Solution pack, use the Power CMS Solution pack serial.