Simple method to download a file from webspeed server

I am having some trouble finding a simple method of downloading a file (.tiff image) from our webspeed server.

My scenario is that I need to download the image to a temp location then use a LibTiff tool -> tiff2pdf to convert the image to a pdf and then download that converted file to the users local download location.

The file conversion works great, but the download part is giving me uphill.

Any help on this would be greatly appreciated.