This works for me and you should be able to modify your script accordingly.

#!/usr/bin/env perl
use strict;
use warnings;
use File::Fetch;

my $url = 'http://perldoc.perl.org/File/Fetch.html';
my $ff = File::Fetch->new( uri => $url );
my $where = $ff->fetch( to => '/tmp' ) or die $ff->error;
my $file = $ff->output_file(); # name of local file
print "Fetched $url and stored as $file.\n";
[download]

[mmusgrove@dev2 ~]$ ./ff.pl
Fetched http://perldoc.perl.org/File/Fetch.html and stored as Fetch.ht
+ml
[mmusgrove@dev2 ~]$ ls -al /tmp/Fetch.html
-rw-rw-r-- 1 mmusgrove users 38348 Jun 23  2013 /tmp/Fetch.html
[download]

Update: I even tested it on Windows with Strawberry Perl.

#!/usr/bin/env perl
use strict;
use warnings;
use File::Fetch;

my $url = 'http://perldoc.perl.org/File/Fetch.html';
my $ff = File::Fetch->new( uri => $url );
my $where = $ff->fetch( to => 'C:/TEMP' ) or die $ff->error;
my $file = $ff->output_file(); # name of local file
print "Fetched $url and stored as $file.\n";
[download]

C:\Users\mmusgrove\Desktop>perl ff.pl
Fetched http://perldoc.perl.org/File/Fetch.html and stored as Fetch.ht
+ml.

C:\Users\mmusgrove\Desktop>dir C:\TEMP
 Volume in drive C has no label.
 Volume Serial Number is 48AA-B4E2

 Directory of C:\TEMP

01/10/2014  11:32 AM    <DIR>          .
01/10/2014  11:32 AM    <DIR>          ..
06/23/2013  02:53 PM            38,348 Fetch.html
               1 File(s)         38,348 bytes
               2 Dir(s)  165,768,085,504 bytes free
[download]