Hello ,
If you can provide us your site url, admin username and password we will try to import demo data on your site as free services. Please contact us
Here is alternatives method to import demo
1. Extract the downloaded zip file, there will be 3 files with extension xml, wie and dat
2. Import xml file using WordPress Importer ( https://wordpress.org/plugins/wordpress-importer/ )
3. Import wie file using Widget Importer & Exporter ( https://wordpress.org/plugins/widget-importer-exporter/ )
4. Import dat file using Customizer Export/Import ( https://wordpress.org/plugins/customizer-export-import/ )
Thanks