Hello, Tamara,
Thank you for contacting us and for using XStore.
1/ The plugin is no the WP rocket plugin, so we can’t activate it – https://prnt.sc/B1iD9XlGGnqq
2/ You need to update the theme – https://prnt.sc/GG4FnC3vG_vS
Please do not update the Core plugin before the theme update next time.
3/ We would recommend you to check the settings of the plugin also – https://docs.wp-rocket.me/article/1382-never-cache-cookies https://docs.wp-rocket.me/article/1491-using-wp-rocket-on-your-woocommerce-site
To make sure that they are not causing errors visible via the browser console.
Kind Regards,
8theme team