To install Zend Optimizer and Ioncube Loader, you will need to download the packages according to your version of PHP on Linux. In this case, the PHP version is 5.2.
- Zend Optimizer Download: http://www.zend.com/en/products/guard/downloads
- Ioncube Loader Download: http://www.ioncube.com/loaders.php
Download these packages and extract them to a place of your choice on your Linux server. I chose to save them to /usr/local/lib/zend/ and /usr/local/lib/ioncube/ respectively.