Import process needs server to support full import. Many shared hostings limit services such as: Your PHP memory, file upload size, and/or execution limits are set too low. And these have to be corrected by hosting on in your hosting account (if your hosting allows you to do that).
How To Verify Your Current PHP Limits
Even if you make changes in wp-config, it is very possible the limits do not change because your server is limited from server settings. You can verify your PHP configuration limits by installing a simple plugin – https://wordpress.org/plugins/wordpress-php-info/
If you see limits don’t change you can always contact your host and ask them what the current settings are and have them adjust them if needed.
Please note though that many hosts will try to keep the PHP limits.
After you change the settings we can try as well. For that please open a ticket in our client support system with your site url and wp-admin – http://support.wpestate.org/