Porto can be installed blank or with demo content. Please check files from the documentation.

- Documentation for Magento CE 2

http://www.portotheme.com/magento2/porto/documentation/

- Installation Video Guide for Magento CE 2.x

http://www.portotheme.com/magento2/porto/video_guide/

- Porto Icon Fonts Demo for Magento CE 2.x

http://www.portotheme.com/magento2/porto/icon-fonts/demo.html

DOWNLOAD TEMPLATE FROM HERE