It seems that its only possible to upload files over FTP using:
https://wiki.jenkins-ci.org/display/JENKINS/Publish+Over+FTP+Plugin
But I need to download a
There is now an SSH2Easy plugin available that supports sftp to/from remote systems. My company has moved to requiring use of sftp and won't allow ftp any longer.
This plugin, at the time of this reply, still needs some polishing, but it does work.