I go to the Slider Revolution setting and click “Add slider from template”, and I found a button to install (free template). However when I click it, it just ask me to activate the plugin. What can I do?
As you see in screenshot. In this case you buy Revolution slider via theme.
You can update via theme update.
If you want to update or get template you need to buy single license to get purchase code (We bought extended license and using in our theme).
Here is document of Revolution Slider: https://www.themepunch.com/revslider-doc/slider-revolution-documentation/
To import created slider demo you can follow steps import revolution slider demo as in this topic: