Hey Hazel,
thanks for the heads up! It’s indeed the theme author who is responsible for updating the integrated plugins; I’ve included the latest version of the Revolution Slider in the update of the Kanso theme to version 1.7, along with several other fixes and improvements. The update has been submitted today, you should be able to download the latest version of Kanso from the “Downloads” tab of your ThemeForest account by Friday. Thank you for your patience!
Sincerely,
Andrii / Satori Studio