Adding a link to download the original image to a view I would like to add at the end of the description a link like saying "Download HiRes Image" at the end of the caption of the image in this view, but I don't know how. I did try with the module DownloadFile but there is no documentation about it.

http://www.nellens.com/home/photos-full/segunda-serie
You can use the DownloadFile module, which allows you to download Files or Images, and it's usable in views.