Hello,
There was a faulty version of WiseFTP delivered to some 1&1 customers a while ago - this might cause the trouble. Please de-install that version and install the most current 1&1 version. You can find that version at this download link:
http://212.227.222.247/service1u1/wiseftp3.exe
With this version your unlock code (1&1 call it license number) should work just fine.
The problems with the import function seem to appear from time to time at certain 1&1 user accounts, unfortunately we could not repdocude this error yet. We suggest, that you enter your connection information manually, thanks a lot for your understanding.
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Best regards
AceBIT - Support -