BN99000-00-00-1 
1KM6-X611-RH1B-XZXA 

exit CADKEY
At Screen Bottom left, click START, click Run
Type 'regedit' in the open box, click OK or press return
press CTRL + F, type 'globet', press return
regedit will eventually (up to 30 seconds) highlight the registry entry 'Globetrotter Software Inc.', press the delete key and click the YES or OK button.
close regedit and re-run CADKEY

Hey presto you have another 30 days.