Hi
You need to deactivate theme in XStore > Dashboard and activate it again using your purchase code. After that you need to go to WP Dashboard > Updates > press “check updates” button to force check and clear cached links and only after that try to update theme and XStore core plugin.
To update theme using autoupdates follow the steps described in the comment or use FTP method to update theme https://www.8theme.com/documentation/xstore/theme-installation/theme-update/















