At the time of installation you may get a message like “Import failed,” . in that case it means your server PHP configuration limits is the reason for the problem. You should contact your hosting provider and asked them to increase those limits to a minimum as follows.
max_execution_time 300 or above
You can verify your PHP configuration limits by installing a simple plugin. You will find it here https://wordpress.org/plugins/php-info-wp/
You can also check your PHP error logs to see the exact error.