Your website not related to php53s. This php53s using by Kloxo-MR only.
Your website using php-branch (see 'webserver configure') or one of 'Php Used' if PHPm series (PHP for next 'multiple php').
Sadly, at this moment, PHPm series not able installing via panel. Need install from ssh like 'sh /script/php53m-installer', 'sh /script/php54m-installer' and 'sh /script/php55m-installer'.