Hello,
Thanks for contacting us.
Try to (1) deactivate theme in XStore > Dashboard and activate it again using your purchase code. (2) After that you need to go to WP Dashboard > Updates > press “check updates” link to force check and clear cached links and only after that try to (3) update theme and XStore core plugin.
OR update the theme via FTP – https://xstore.helpscoutdocs.com/article/63-theme-update
https://xstore.helpscoutdocs.com/article/37-plugins-update
OR provide us with temporary wp-admin and FTP access, so we can help you with the update.
Regards