winscp.com /ini=nul /command ^
    "open sftp://username:password;fingerprint=hostkeyfingerprint@example.com/" ^
    "put -filemask=*>=%%TIMESTAMP#yyyy-mm-dd%% ""c:localpath*"" ""/remote/path/""" ^
    "exit"

string winscpPath = Dts.Variables["winSCPPath"].Value.ToString();
string username = Dts.Variables["ftpUsername"].Value.ToString();
string password = Dts.Variables["ftpPassword"].Value.ToString();
string ftpSite = Dts.Variables["ftpSite"].Value.ToString();
string localPath = Dts.Variables["localPath"].Value.ToString();
string remoteFTPDirectory = Dts.Variables["remoteFTPDirectory "].Value.ToString();
string sshKey = Dts.Variables["sshKey"].Value.ToString();
Boolean winSCPLog = (Boolean)Dts.Variables["winSCPLog"].Value;
string winSCPLogPath = Dts.Variables["winSCPLogPath"].Value.ToString();

SessionOptions sessionOptions = new SessionOptions
{
Protocol = Protocol.Sftp,
HostName = ftpSite,
UserName = username,
Password = password,
SshHostKeyFingerprint = sshKey
};

try
{
  using (Session session = new Session())
  {
    // WinSCP .NET assembly must be in GAC to be used with SSIS,
    // set path to WinSCP.exe explicitly, if using non-default path.
    session.ExecutablePath = winscpPath;
    session.DisableVersionCheck = true;

    if(winSCPLog)
    {
      session.SessionLogPath = @winSCPLogPath + @"WinscpSessionLog.txt";
      session.DebugLogPath = @winSCPLogPath + @"WinscpDebugLog.txt";
    }

    // Connect
    session.Timeout = new TimeSpan(0,2,0); // two minutes
    session.Open(sessionOptions);

    TransferOptions transferOptions = new TransferOptions();
    transferOptions.TransferMode = TransferMode.Binary;

    try
    {
      session.GetFiles(remoteFTPDirectory + "/" +
      fileToDownload, localPath, false, transferOptions);
    }
    catch (Exception e)
    {
      Dts.Events.FireError(0, null,
      string.Format("Error when using WinSCP to download file: {0}", e), null, 0);
      Dts.TaskResult = (int)DTSExecResult.Failure;
    }
  }
}
Dts.TaskResult = (int)ScriptResults.Success;