This plugin integrates reCaptcha v2 into Joomla 1.5. The plugin is based on https://github.com/milkycode/joomla_recaptcha_j15.
Install via the standard Joomla installer.
Copy the source code url (.zip) from the releases page.
In order to properly use Recaptcha, you will need to create an account at the recaptcha site. Once you have finished, copy the public and private keys for your site and then visit the Joomla Administrator.
- Go to Extensions > Plugin Manager
- Click the System - Recaptcha plugin.