Hello,
The message is from our console sftp client. If it has been installed on a system without a registration key, it will display the message "Unlicensed version" and run. When you enter a registration key, the message will go away.
If you have a registration key for FortressSSH Server, you can get rid of the message by entering the key at a command prompt opened with elevated privileges, by using the "run as Administrator" option, and entering the command:
pragmareg CLIENTSUITE
registration_key