What you most likely need to do is add an

  <a href="http://server/selectionpage.html">Anchor</a>
[download]

to the output of the script... which is viewable in a browser right?

Check the CGI.pm authors website use your magical find feature to find the term "anchor link", or the perldoc in question for the methods for making the tag... though if you just print "<a>whatsit</a>"; it might just work... you'll most likely need to escape stuff though that might confuse perl while it parses your poo.