Hello,
I was in the process of manual installation of PostfixAdmin 3.3.13 (latest version) downloaded from
https://github.com/postfixadmin/postfixadmin/archive/refs/tags/postfixadmin-3.3.13.zip
on Centos7 with PHP 7.0, MYSQL 5.5, Apache 2.2.
However, I found that version number is not yet updated. It's still showing 3.3.11 :

So to check further I inspected the 'config.inc.php' file under root directory on Line 703
$CONF['version'] = '3.3.11'; which should be
$CONF['version'] = '3.3.13';
Could you please update this ?.
Regards.