The link you posted is just a Zend Framework tutorial and does not update after ZF 1.5.
In any case, once you get started with Zend, this is a sample code that you will use to get the download. The posting form must contain the correct components for uploading files.
$upload = new Zend_File_Transfer_Adapter_Http();
$upload->addValidator('Count', false, array('min' =>1, 'max' => 1))
->addValidator('IsImage', false, 'jpeg')
->addValidator('Size', false, array('max' => '512kB'))
->setDestination('/tmp');
if (!$upload->isValid())
{
throw new Exception('Bad image data: '.implode(',', $upload->getMessages()));
}
try {
$upload->receive();
}
catch (Zend_File_Transfer_Exception $e)
{
throw new Exception('Bad image data: '.$e->getMessage());
}