Drupal's configuration management system will not allow the import of configuration entities that originated at a different Drupal site. When a Drupal site is installed, the system.site configuration entity saves a UUID for the current site instance. Only cloned versions of this site's database can accept configuration imports from it.

The configuration installer profile is a custom distribution, that will allow you to import the configuration despite the configuration's site UUID. The profile doesn't install itself. When you use the profile, it will provide an interface to upload a configuration export that will then be imported, as shown in the following screenshot:

The distribution can be found at https://www.drupal.org/project/config_installer.