its giving import error. demos are not getting downloaded. error 500
So, with a 500 error:
1) maybe it's the configuration of php.ini values.
To be sure, you should see the logs.
Please enable WP Debug logs and check what kind of error occurs when trying to import. More info on how to enable WP Debug Logs can be found here :
https://www.wpbeginner.com/wp-tutorials/how-to-set-up-wordpress-error-logs-in-wp-config/
So, let us know what the error is, so we can help you further.
2) Is this a new site, with nothing? If so, you can use WP Reset Plugin to clean it up if too much data is causing problems.
3) your store is in production and you already have orders. If yes, depending on the quantity of orders (a lot), it can generate errors with Woocommerce during the import.
Come back with some information.
See you soon.