The Divi Builder plugin is a great way to extend the power of Divi Builder to any other WordPress theme except Divi and Extra.
Note: You do not need to install the Divi Builder Plugin if you already use the Divi theme or Extra Theme. The Divi Builder is built into both themes, and the plugin is not needed.
In your Member's Area, under the Divi Builder plugin, it is also mentioned that the Divi Builder plugin is not required if you are already using the Divi Theme.
The Divi Builder plugin can be installed on any WordPress website if the active theme is not Divi or Extra.
To learn how to install the Divi Builder plugin on a WordPress website that doesn't use Divi or Extra, please check the article below: