Hello,
Thanks for contacting us. Please read our docs – https://xstore.helpscoutdocs.com/article/4-theme-package and watch video – https://youtu.be/4n1re0jKorc It looks like you are trying to instal wrong archive (full package instead WP theme only). Or you did not check requirements – https://xstore.helpscoutdocs.com/article/60-xstore-theme-requirements Read this article also – https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-link-you-followed-has-expired-error-in-wordpress/
Regards
