how to make download counter ?

I need to count download cakebaker guide me to use

$this->MyFile->updateAll(array('Script.download_counter'=>'Script.download_counter+1'),
array('Script.id'=>40));

I put it in

if ($id != null) {
$file = $this->Script->findByid($id);
$this->MyFile->updateAll(array('Script.download_counter'=>'Script.download_counter+1'),
array('Script.id'=>40));
header('Content-type: ' . $file['Attachment']['file_content_type']);
header('Content-length: ' .
$file['Attachment']['file_size']); // some people reported problems
with this line (see the comments), commenting out this line helped in
those cases
header('Content-Disposition: attachment; filename="' .
$file['Attachment']['file_name'] . '"');
echo $file['Attachment']['file_object'];

exit();

It's doesn't work

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