I would compress the file as a zip and then using (as Daniel says) the url:
${resourcesFolderName}/FILENAME.pdf.zip
or just
${resourcesFolderName}/FILENAME.zip
and placing it in a link tag or connecting it to a button with a “new function…” javascript on click as follows:
window.open("${resourcesFolderName}/FILENAME.zip", "_blank");
should enable the document to download immediately.
NOTE If you go the route of using the *download attribute then it won’t work in Safari or IE