win10下安装phpstudy，最低版本5.2.17，怎么解决呢内容如下
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Zend Optimizer not installed
This file was encoded by the Zend Guard. In order to run it, please install the Zend Optimizer (available without charge), version 3.0.0 or later.
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The component "Zend Optimizer" is not installed on the Web Server and therefore cannot service encoded files. Please download and install the Zend Optimizer (available without charge) on the Web Server.
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What is the Zend Optimizer?
The Zend Optimizer is one of the most popular PHP plugins for performance-improvement, and has been available without charge, since the early days of PHP 4. It improves performance by scanning PHP's intermediate code and passing it through multiple Optimization Passes to replace inefficient code patterns with more efficient code blocks. The replaced code blocks perform exactly the same operations as the original code, only faster.
In addition to improving performance, the Zend Optimizer also enables PHP to transparently load files encoded by the Zend Guard.
The Zend Optimizer is a free product available for download from Zend Technologies. Zend Technologies also developed the PHP scripting engine, known as the Zend Engine.
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phpStudy是自带Zend Optimizer和Zend Guard Loader，
但是很多人老是问我怎么没有zend或提示Zend Optimizer not Installed
phpStudy默认启动是的apache+php5.3+Zend Guard Loader，
但是php5.3及以后的版本Zend Optimizer改名Zend Guard Loader。
是zend官方改名不是我改的哟。
也就是说需要Zend Optimizer的程序将不能安装到php5.3以后的版本。
所以下载phpStudy之后切换到php5.2即可解决问题。
具体可查看以下链接：http://phpstudy.php.cn/a.php/181.html，有详细说明