You should not install it as a plugin. Kindly, follow the steps below.
Step 1 : Login to Dashboard.
Step 2 : Go to Layerslider WP at the left side menu.
Step 3 : You can see the option of “Import and Export Sliders”.
Step 4 : In the import slider section. Just browse and select the zip file we sent and click import.
Step 5 : Thus the demo slider is created.
Step 5 : Now select that slider from ”Slider Options” in the home page below the editor. Hope it is clear.