Copy the dry_accessible_captcha directory into system/expressionengine/third_party. Install, add some questions and answers in the settings. That's it! Note: If you have a previous version installed and that addon is in a pur_accessible_captcha directory then please uninstall before installing this version. This package contains the Twig library by Fabien Potencier. Any licence applicable to Accessible Captcha for ExpressionEngine 2.x does not apply to Twig. Please see http://twig-project.org Download: https://github.com/dry/accessible-captcha.ee2_addon/archive/master.zip