After activation, You will see something like the following message.
In order to make the theme look exactly as the demo page, you need to install recommended plugins. You have to go to Appearance > Install Plugins menu to be redirected to the plugins installation page. Check all listed plugins, select Install option and click on Apply button. Installation may take a few minutes, please be patient and do not refresh the page.
After the installation you will get a notification informing that plugins were installed successfully.