Hello,
If you want to import just a slider then go to https://www.8theme.com/downloads and download XStore import files archive, extract it and find the engineer folder inside. You’ll be able to find slider.zip archive. Import in (Revolution Slider > Import > upload archive). After that just add the slider element to your home page.
If you want we could also help you with this. Just provide us with WP Dashboard access to your site.
Regards