The relevant part of your script is:

  my $content = get($url);                             #41
  die "Couldn't get it!" unless defined $content;
[download]

Most likely, either the website returned an error (see LWP::Simple).

For better diagnostics, you might want to want to look at LWP::UserAgent.

There is very little we can do here, since the problem is likely between you and the remote site and not with the code.