You should update the as soon if your Slider Revolution is VERSION 4.1.4 OR OLDER.
– How to know my Slider Revolution version:
– check Revolution Slider of left bar in wp-admin screenshot
– How to update the Slider Revolution?
– Download the latest version of Aside from themeforest.net, unzip it.
Find aside/functions/plugins/revslider.zip and unzip it.
upload the revslider folder to xxx\wp-content\plugins\ of your space by FTP.