how to install Zend Guard Loader

[akqzx]

HI
1,I downloaded ZendGuardLoader-php-5.3-Windows.zip
2,put ZendLoader.dll to D:\Program Files (x86)\zend\php5.3\
3,Edited D:\Program Files (x86)\Parallels\Plesk\Additional\PleskPHP53\php.ini
[Zend.loader]
zend_extension="D:\Program Files (x86)\zend\php5.3\ZendLoader.dll"
zend_loader.enable=1
zend_loader.disable_licensing=0
zend_loader.obfuscation_level_support=3
zend_loader.license_path=

when I check phpinfo ,only had
This program makes use of the Zend Scripting Language Engine:
Zend Engine v2.3.0, Copyright (c) 1998-2014 Zend Technologies
with the ionCube PHP Loader v5.0.17, Copyright (c) 2002-2015, by ionCube Ltd.

Had any idea？