You need install base demo content as described in the documentation http://www.8theme.com/classico-theme-documentation/ (paragraph “2.4. Demo Content”).
Our demo site only shows all features that are available in the theme and they can be achieved with help of the plugins Visual Composer and Ultimate VC Addons.
You can find other pages in the theme package that you downloaded in “XML Files” > “Additional Pages” folders. Import .xml file in wp-admin panel > Tools > Import > WordPress, upload chosen .xml file, press “Upload File” and import, check “Download and import file attachments” and press “Submit” button.
Then you’ll find imported pages in the “Pages” section of wp-admin panel.