I was about to post a reply with similar suggestions... Now the only new things I can add are

• on a Mac the

  BEGIN{
      @ARGV=map glob, @ARGV;
  }
  [download]

  is definitely not required.
• I also noticed that the OP is using #!C:\Perl as the shebang line. On a Mac this should be #!/usr/bin/perl for an Apple-supplied Perl, but will need a different path if it's a user-installed Perl (e.g., from MacPorts, or elsewhere)

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