After importing the demo content, you may read a message saying that a slider is missing on pages that include a slider designed with the Slider Revolution plugin.
The demo sliders can't be imported automatically using the one-click demo import feature. You must import them manually.
First, get the link to download the slider template files in your theme documentation, in the Install Revolution Sliders section.
Download the demo data files.
You will find the demo sliders in the revslider folder.
To import a slider, navigate to your admin Slider Revolution panel, click on the "Import Slider" icon and select your chosen slider zip file from the "revslider" folder.