Visual Composer and Revolution slider come bundled with our theme but they can’t be activated with our purchase code. Actually, you don’t need to do this. Only in case you want to get free premium support from it’s author and wants to use the plugin Library and this is Envato Policy you may wish to confirm from them as well, you can purchase it from codecanyon. But it is not necessary since we will always provide you with the latest updates.
To get that paint brush functionality. It seems that specific effect not included in the free package. You will have to get the premium version of slider revolution and ask the plugin support team for that effect.