Fixed on the staging site.
Download isotope.min.js file by this link https://dropmefiles.com.ua/en/Zf7x3VwEP , and reupload it into wp-content\themes\xstore\js\modules folder on your live site via FTP. After that, clear all cache and CDN, then check the result.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.