The 'File' menu at the top has the option to export and import the BuzzCalc setup. Included are:
BuzzCalc has a 30 day trial period. To continue the trial after expiration, you may uninstall BuzzCalc and reinstall it again. All data however will be removed. There is no limit on reinstallations.
Follow the link on the registration window to purchase. You should receive your license key shortly afterwards. If there are any problems, please email email@example.com.