It is not possible to activate the trial version. Please uninstall it. Then download and install the full version. You can find the download link in the e-mail which also contains the serial key we sent you.
When you first start the Office after the installation it will ask for name, e-mail and serial key. Please type in these details exactly as stated in the registration mail as the serial number is based on your name and e-mail address.
SoftMaker Software GmbH