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SFTP: Download remote file to local file or stream
File transfer methods of TElSimpleSFTPClient class have TransferMode parameter, which specifies how the component behaves when the remote file with the specified name exists.
When TransferMode is set to FileTransferMode.ftmResume and the destination file is smaller than the source file / stream, the transfer is resumed from the position next to the size of the detination file.
