Upload demo.zip file to your web server in the folder /WP-CONTENT/UPLOADS/FW-BACKUP/
Go to WP-ADMIN > TOOLS > BACKUP.
Select the archive you want to import then click restore Backup. See screenshot: http://d.pr/i/gexh
When you click restore backup and you have no error message but it used to load for more than 10 minutes, it means you have issue with your web server or WordPress install. Ask your web host to raise the max_execution_time to 600 on PHP.INI.