Hello, @Krzysztof,
1. Our Theme Xstore is compatible with the YITH WooCommerce Badge Management Premium plugin. See image for better reference : https://postimg.cc/BjMrSNRn
You can check and read changelog here : https://xstore.8theme.com/update-history/
2. Could you please share your site WP Admin URL and Credentials with me here, in the private content area of this topic, like below listed format, so that I’ll check it for you further on your site.
WP Admin URL:
WP Admin Username:
WP Admin Password:
Regards 8Themes Team.