You need to install WooCommerce plugin first. To get the best experience of Single Product Customizer for WooCommerce Plugin, we recommend the following:-

PHP: 7.4 as it is recommended by WordPress and WooCommerce
Database: MySQL 5.6 or later
WordPress: 5.0 or later
WooCommerce: 4.5+
Browser: Chrome, Firefox, Safari (recommended), IE 12+ (latest version)