Please read our documentation – http://www.8theme.com/demo/docs/classico/ (5.6. Blog Page)
We included all the demo versions and additional pages import to XML Files folder of theme package. XML files can be imported via Tools > Import > WordPress.
Our demo products, posts and projects include placeholders which you replace when create real site. Besides if you check theme documentation http://8theme.com/demo/docs/classico/#theme_installation_and_upgrade you’ll see the following notice Important: Images you get after demo content import can neither be used on a live site, nor redistributed. If you want to find out where images came from to buy the license use image search engine https://www.tineye.com/
We excluded real images from demo content and replaced them by placeholders because many of our clients had the problems with demo content import because of the large size of import file and server settings. With placeholders it takes seconds to import demo content, with images – minutes or some of users, who had limits in server setting, get the error. As a rule, our customers have their own images and there is no any problem to replace placeholders by real images.
Feel free to ask if you have any other questions.