<?
require_once($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/classes/general/update_client.php');
$errors = null;
$stableVersionsOnly = COption::GetOptionString('main', 'stable_versions_only', 'Y');
$updateList = CUpdateClient::GetUpdatesList($errors, LANG, $stableVersionsOnly);
echo "<pre>"; print_r($updateList); echo "</pre>";
?>