......
 
if (isset($_GET['download_id']) && isnum($_GET['download_id'])) {
	$res = 0;
	if ($data = dbarray(dbquery("SELECT download_url,download_cat FROM ".$db_prefix."downloads WHERE download_id='".$_GET['download_id']."'"))) {
		$cdata = dbarray(dbquery("SELECT * FROM ".$db_prefix."download_cats WHERE download_cat_id='".$data['download_cat']."'"));
		if (checkgroup($cdata['download_cat_access'])) {
			$res = 1;
			$result = dbquery("UPDATE ".$db_prefix."downloads SET download_count=download_count+1 WHERE download_id='".$_GET['download_id']."'");
			redirect($data['download_url']);
		}
	}
	if ($res == 0) redirect(BASEDIR."muzika");
}
 
.....