1/ Try to disable all the third-party plugins (including cache plugins and CDN), that do not come bundled with XStore https://xstore.helpscoutdocs.com/article/36-included-plugins , clear cache of browser/server, and check then. Maybe one of the additional plugins is a reason for the problem.
2/ Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
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