About Windows Stop PHP5.3 can't install Zend Optimizer

About Windows PHP5.3 cannot be installed Zend Optimizer
Because there is no way to install Zend Optimizer so I downloaded the zendloader I put in the Ext folder. And finally added the php.ini to the
[Zend.loader]
Zend_loader.enable=1
Zend_loader.disable_licensing=1
Zend_loader.obfuscation_level_support=3
Zend_loader.license_path=
zend_extension= "F:\LAMP\PHP\ext\ZendLoader.dll"


It's still not showing. I don't know what's wrong. Please, you know, thank you for your advice.

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------Solution--------------------
PHP 5.3 does not have Zend Optimizer, now the name is Zendguard

and Zendguard and Zend Optimizer encryption can not use each other, if you use Zend Optimizer encrypted files, you can only use up to PHP 5.2

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