If you know the exact URL of the file you want to download, you can download it at the shell prompt using
wget or
curl.
If the file is coming from a server-side script that doesn't want to work using wget (so that you have to download it using a local workstation), you can get it onto the server in a few ways:
* Use
WinSCP to transfer the file to any location on the server
* Create an ibay (if you haven't already done so), connect to it over the network, and copy the downloaded file to it (or just save the download directly into the ibay).