Read this carefully!

1. First go to Import / Export from backend menu located at /wp-admin/admin.php?page=cosmothemes__extra&tab=io
and COPY the content of the 01_import.txt file into the "This is the import zone" textarea.

2. After succesfull import of site structure you can upload the 02_wordpress.xml file using the built-in WordPress import plugin: Tools - Import located at /wp-admin/import.php

3. Choose WordPress if you already have the plugin installed /wp-admin/admin.php?import=wordpress then follow the steps on the screen.