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./othercms/ips_4.3.4/applications/downloads/setup/upg_101079/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        28 Nov 2016
 */

$path = \IPS\ROOT_PATH . '/applications/downloads/extensions/core/ContentRouter/downloads.php';

/* Windows is case-insensitive, so we don't need to check in that case (no pun intended) */
if( \file_exists( $path ) AND !\unlink( $path ) )
{
   
$message = \IPS\Theme::i()->getTemplate( 'global' )->block( NULL, "The following file could not be deleted automatically and should be manually removed:<br><pre>{$path}</pre>" );
}