<?php 
function _curl($url, $info = false) 
{  
    $options = array(
		CURLOPT_URL				=>	$url,
		CURLOPT_REFERER			=>	$url,
		CURLOPT_RETURNTRANSFER	=>	true,
		CURLOPT_HEADER			=>	false,
		CURLOPT_FOLLOWLOCATION	=>	true,
		CURLOPT_USERAGENT => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_0) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.79 Safari/537.1'
	);

	$ch   = curl_init();
	curl_setopt_array($ch, $options);
	$data = curl_exec($ch);
	if( $info === true ) return curl_getinfo($ch);
	
	return $data;

}

$url  = 'http://xooplate.com/templates/download/11610';
$info = _curl($url, true);

header('Content-Type: ' . $info['content_type']);
header('Content-length: ' . $info['download_content_length']); 
header('Content-Disposition: attachment; filename="app.zip"');
echo _curl($url); 
?>

content_type'a göre filename="app.UZANTI" kısmını belirlemen lazım sadece. Her dosya .zip uzantılı olmayabilir.