Allow directory browsing from your webserver, then just provide a link to that directory..
When they click on the link, should give them a directory listing of all files in that directory, allowing them to click on them to download...
heres an example...
http://denial.dyn.dhs.org/eqimages/old
btw.. while your looking in that directory, here's one of my favorites.. Wish I could remember who on IRC sent this to me..
http://denial.dyn.dhs.org/eqimages/old/godkills.jpg