Joomla! 5.2 and later plugin to integrate with Google Invisible reCAPTCHA.

This plugin can replace the core Joomla! “CAPTCHA - Invisible reCAPTCHA” plugin which is no longer shipped with Joomla! as of Joomla! 5.2.

Download and install the extension's ZIP file.

Go to System, Manage, Plugins and edit the “CAPTCHA - Google Invisible reCAPTCHA” plugin. You need to enter the Site Key and Secret Key. You can find these in your reCAPTCHA account.

Go to System, Global Configuration and select this plugin as your Default CAPTCHA instead of Joomla's now-defunct “CAPTCHA - Invisible reCAPTCHA”. If you have any extensions which were using Joomla's now-defunct plugin explicitly configure in them, remember to edit their options and choose the “CAPTCHA - Google Invisible reCAPTCHA” plugin instead.

Then, go to System, Manage, Plugins and disable Joomla's now-defunct “CAPTCHA - Invisible reCAPTCHA” plugin.

That's all there is to it.