Hello,
I’m not sure that clearly understand your request. So, let’s clarify:
1) Do you have some problems with theme activation? Provide us with WP Dashboard and FTP access to your site to check it in more detail
2) Do you use out of date version of XStore theme and need to update that? We would recommend you to create staging site (full copy of the production site you have) and provide us with WP Dashboard and FTP access to your staging site. We’ll update theme and all the bundled plugins there. You’ll check if everything is ok. If yes then we’ll update production site. In case you find any issues we’ll be able to fix them and update production site only after that. It’s the safest way to update theme from 7.x to 8.x version.
Regards