You can either uninstall Dummy Content by using the core extension manager available in the Joomla! Administrator Control Panel, or by using the powerful Regular Labs Extension Manager. If you no longer use any Regular Labs extensions, you can also uninstall the Regular Labs Library plugin by using the Joomla! core extension manager.
Dummy Content will only work correctly if your setup meets these requirements: Up-to-date version of Joomla: Joomla 3.9.0 or higher PHP 5.6 or higher MySQL 5 or higher Important: I can only provide support for setups that: meet the above requirements; do not have extension files or Joomla! core files which have been altered in any way.