&mirror could be handy here.

use strict;
use LWP::Simple;
use File::Slurp qw/ read_file /;

my $upgrade_file = './upgrade.log';
my $url = 'http://download.fedora.redhat.com/pub/fedora/linux/core/4/i
+386/os/Fedora/RPMS/';

for (read_file($upgrade_file)) {
    chomp;

    print "Checking $_... ";

    my $status = mirror($url . $_, $_);

    print $status == RC_OK           ? 'downloaded'
        : $status == RC_NOT_MODIFIED ? 'already downloaded'
        : "error: $status";
    print "\n";
}

print "Download complete.\n";
[download]

ihb