Great Plugin - Thank-you very much.
I just upgraded to the latest version and remembered a small fix I had to do and thought this time I would pass it along..
in the file wp-download-monitor.php line  in the function get_option_children_cats I changed:
$string.= get_option_children_cats($c->id, "$chain$c->name — ",$current);
$string.= get_option_children_cats($c->id, "$chain$c->name — ",$current,$showid);
Simply adding the $showid variable, without it, if you have a deep nesting of categories (3+ I think) then the ID's start showing up where they shouldn't when used with the legacy tag [#advanced_downloads].