Important Warning: Deleting the slider revolution plugin from your site will also delete all your slides. So if you wish to update the Slider revolution plugin just like your Visual Composer plugin then you will have to first export your slides so you can re-import them later. Below is a better method for updating your Slider Revolution plugin.
Updating Via The Theme
Whenever you update the Total theme if there is an update to the Visual Composer it will display in your WordPress dashboard as an available update as well as in the “Recommended Plugins” list.
You can always update the plugin manually. The plugin zip file can be located inside the theme at Total/framework/plugins/revslider.zip and you can extract it and replace all files manually via FTP at wp-content/plugins/