I changed
// admin paths
define('ADMIN_FOLDER_NAME', 'admin');
to
// admin paths
define('ADMIN_FOLDER_NAME', 'newadmin');
and edited crontab to
#commented out old cron
#0 0 * * * php /path/to/your/install/admin/tasks/auto_prune.cron.php >> /dev/null 2>&1
#0 0 * * * php...