I hope you are well today and thank you for your question.
If you have not purchased slider revolution plugin and using the plugin bundled with the theme then you are not direct customer of that plugin so can not activate the license of that plugin.
Please see more information about this on the following pages.
To use the plugin, you can just install and activate the plugin from Appearance -> Install Plugins
Also the WPbakery page builder plugin comes with the theme and you can install it as described in the following page. You don’t need to purchase it and activate the plugin license to use it.