To use an upgrade code you must first have the base version licensed, which is the Standard Edition. First enter your name/unlock code pair that has the 01-01.. code, then use your 01-05 code to upgrade the license and features to the Professional Edition.
To regenerate your license code, Please refer to
http://www.nc-software.com/policies.aspx specifically the "Lost Unlock Codes" section for information assisting in this matter. If unable to use our automated resources to recall your lost registration information or provide proof of purchase, please purchase the unlock code re-key service from the URL below which may require prior proof of purchase to complete:
http://secure.nc-software.com/rekey