The Revolution Slider plugin should already be activated if you followed the "Plugin Installation" instructions in the "Getting Started" section of this documentation. If it's not activated you can go to Plugins and click Activate for Revolution Slider.
Go to Slider Revolution and click Import Slider, upload the file accommodation-single.zip, and then repeat for the files homepage-1.zip, homepage-2.zip, homepage-3.zip, homepage-4.zip, homepage-5.zip and homepage-6.zip