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./othercms/ips_4.3.4/applications/core/setup/upg_40000/postUpgrade.php
<?php
/**
 * @brief        Upgrader: Custom Post Upgrade Message
 * @author        <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
 * @copyright    (c) Invision Power Services, Inc.
 * @license        https://www.invisioncommunity.com/legal/standards/
 * @package        Invision Community
 * @since        16 May 2016
 */

$message = \IPS\Theme::i()->getTemplate( 'global' )->block( NULL, "Please take a few minutes to thoroughly review your community for any issues. If any issues are found, please use the Support tool in the ACP for further assistance." );