Hello,
You have installed an old version of XStore theme, we’ve updated the theme, but there is an error once try to activate the theme – https://prnt.sc/SQP9w_0PYBiX It looks like something is wrong with your server. Contact your hosting provider and ask about assistance.
As we can see, you are using CDN, try to disable it and check if the theme can be activated using the purchase code then. Let us know the result.
Regards