Theme “Sanat” (https://themeforest.net/item/sanat-factory-industry-wordpress-theme/22296547) does not have a Demo Content!!((
Have you checked the documentation for the theme? http://expert-themes.com/documentation/sanat-doc/
Go to Appearance > Theme Options > Utility > Click Import Demo Settings Button
Install and Activate all required plugins and click to Install. The upload process can take up 5 minutes. So please, be patient and do not close the page.