Get Demo import XML files
Download the import data zipped file, if it is available on the account page in the list of available downloads. If it’s not, then send a support request.
Unzipped can contain multiple files: all-in-one demo content or/and separate files for pages content, posts content, etc.
Don’t forget to install and activate recommended plugins that are used in the theme before actually upload the demo data.
Head to your WordPress Dashboard and locate the Tools sidebar menu item. Within this menu, you will see the Import link. Clicking this will bring up the Importer options – Click the WordPress Importer.
If you have not activated the plugins for import you will need to install and activate it.
Upload demo data
Now that your plugin is activated, you’re good to upload the XML file. Choose XML file and click Upload file and import to import the demo data, then click Submit.
Learn More on the WP Codex Page – Importing Content WordPress