How Zend Encrypted PHP works

Zend Encrypted PHP How to run?
Previously did not contact Zend encryption, now on hand there is a Zend encrypted mall system, local can not run, I am local IIS7.5 + php5.2.5
Under the Zend Optimizer installed also can not access. Everyone help Ah, should be installed what software? Or just get a DLL component installed.

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Are you using Zend Guard encryption? What is the encrypted version?
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Zend_optimizer.optimization_level=15
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This is the installation requirements "other: Zend Optimizer 2.5.7 and above", I just finished, Phpinfo () also appeared in Zend project, but now has a new problem:

Fatal error:incompatible file format:the encoded file have format major ID 65540, whereas the Optimizer expects 2 in f:\e cstorev1.0.1\app\base\ego.php on line 1953785203

Are you sure the version for PHP 5.2.x is installed?

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