CrossFTP supports to move license from old computer to new computer. To do this, you can go to the old computer's CrossFTP's Help -> Release License, and register the license at the new computer.
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CrossFTP is a FTP, SFTP, FXP, WebDav, Amazon S3, Amazon Glacier, Microsoft Azure, Google Cloud Storage, and OpenStack Swift client for Windows, Mac, and Linux.
CrossFTP Home: http://www.crossftp.com/