cannot register

I had the trial version installed on my PC until it expired. After this I un-installed this version, bought the licence key and installed the SW again. But still the program won't start. It just asks me to buy the full version since the test period expired. How can I register the produce and enter the license key I recieved after my purchase?
Rgds, Stefan

You can resend your license key at:
https://www.smartftp.com/purchase/lost.php

Then follow the instructions in the license key on how to activate SmartFTP.

Please install the latest version from here:
https://www.smartftp.com/download

Then enter it at the start-up dialog.