Thank you very much for your valuable feedback. I finally decided to roll back to LWP using the following"

my $filename = (URI->new($url)->path_segments)[-1];
print "Filename is $filename \n";

$response = $browser->get($url,
     ':content_file' => "$filename ",
); 
if ($response->is_error()) {
    my $error= "\nCould not open $url\n", $response->status_line;
}
[download]

The problem with the file name remains (unfortunately the URIs can have any possible form so that I'm not sure your Regex will match any URI