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sfFTPLib is not licensed
The following error message is displayed in the log:
sfFTPLib is not licensed.
This error appears if your operating system is not able to verify the digital signature of the sfFTPLib.dll file. This is not a SmartFTP software problem since the file (sfFTPLib.dll) is correctly signed with a valid certificate. To verify the file manually, right click on the sfFTPlib.dll file in Windows Explorer and select Properties. The Properties dialog appears. Select the Digital Signatures tab and click on the Details button. The Digital Signature Details appears. If you see an error either the sfFTPLib.dll is corrupted or there is a problem with your system/configuration.
To workaround this problem: