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Was XStore Core plugin activated successfully? Also, make sure that all 3rd party plugins are disabled before the import. Demo content can be imported incorrectly in case a lot of 3rd party plugins were activated on the site before the import. In this case, provide temporary wp-admin access, we will help you.
It is recommended to run import on a fresh WordPress installation. For this you can use WordPress Database Reset plugin https://wordpress.org/plugins/wordpress-database-reset/ The plugin can be used to remove all the existing content and install a new version from scratch.
Please do the reset and reply with temporary wp-admin and FTP access here. We will help you with the import. Provide URL of the desired demo version. Do you prefer Elementor or WPBakery?