Off-topic, and anal-retentive on my part. Rather than

$FIELDS = {
'AA' => {
        'Description' => '',
        'Type' => 'Module',
        'File' => 'Sample1.pl',
        },
        'BB' => {
        'Description' => 'Initiator',
        'Type' => 'Methods',
        'File' => 'Sample1.pl',
        },
        'CC' => {
        'Description' => 'Destructor',
        'Type' => 'Methods',
        'File' => 'Sample2.pl',
        'Values' => {
            '1' => 'Ignore',
            '2' => 'Retry',
            '3' => 'Abort'
            }
    },
[download]

please consider

$FIELDS = {
           'AA' => {
                     'Description' => '',
                     'Type'        => 'Module',
                     'File'        => 'Sample1.pl',
                   },
           'BB' => {
                     'Description' => 'Initiator',
                     'Type'        => 'Methods',
                     'File'        => 'Sample1.pl',
                   },
           'CC' => {
                     'Description' => 'Destructor',
                     'Type'        => 'Methods',
                     'File'        => 'Sample2.pl',
                     'Values'      => {
                                       '1' => 'Ignore',
                                       '2' => 'Retry',
                                       '3' => 'Abort'
                                      }
                   }
          },
[download]

This shows you the closing curley-brace you forgot after the 'Values' block.

It doesn't really matter what convention you choose, but pick a standard and keep to it.