Hello,
If you can’t activate the WooCommerce plugin even with the default theme it means that our XStore theme is not the reason of the issue. Contact WooCommerce support with this question, please https://wordpress.org/support/plugin/woocommerce/
I could take a look at your site if you provide us with WP Dashboard access but I’m not sure if I help you because we are able to help only with the issues related to our theme. In case problem appears even with the default theme we can’t help as a rule.
Regards