Divi theme must be installed prior to installing ChicServe child theme.
This will give you a quick guide on settings up the theme as per demo site. Note that WordPress and Elementor page builder knowledge is required.
Install and activate theme
Install, activate and setup Divi theme settings
All these plugins are within your downloaded folder.
Setup sidebar widgets
Optional: Setup WooCommerce settings
Optional: Setup Instagram Feed at footer
Edit other pages to meet your preferences
Content Width : 780px
Sidebar Width : 300px
Full Width : 1140px