Below is a screenshot of a common error when installing or updating the Revolution Slider or Essential Grid plugin from a Theme Bundled version.
1. Delete the existing plugin files via FTP
Delete/Remove the folders/files located inside the following directory: wp-content/plugins/revslider/
2. Upload the latest version of the plugin files.
And then upload the latest “revslider” files/folder that can be found inside the zip file that you downloaded from your CodeCanyon account.