Sharepoint FTP synchronization using workflow

I'm having some issues adding the "Send File or Folder to FTP via Aspose.Network" action when trying to design a new workflow in Sharepoint Designer 2010. The action is not added to the workflow. 

There is no problem when sending files through FTP using the ribbon in the web browser, but I would like to automate the process.

I am currently running the evaluation edition of Aspose.Email for Sharepoint if that is relevant. 

Thanks in advance

Simon Vu