What you want is to disable the offending warning message. This can be accomplished like so:

#!/usr/bin/perl
                                                                      
+          
 use warnings;
 no warnings qw /once/;
 use strict;
[download]

Notice that you can't use -w because it is all or nothing, you must use the "use warnings" syntax if you want to be able to disable individual warning messages.

Check out perllexwarn.

HTH