I had to fool with sftp a while back. luckily someone much smarter than me with this type of process had already had something setup with psftp(putty sftp) to connect to the sftp site and move the files TO the site. I worked with what he had and used Ignition to run bat files that issued the relevant sftp commands to perform what i needed. Just throwing an alternate out there. You could always write bat files to pull the data and store it locally where you could then process it. My use case was moving to a sftp server, but I am sure you could move from just as easily. Works great on my end, have never had a failure.