What to do with config.* files (App Bundles)
In 2018, Google introduced a new publishing format called "App Bundles". The core idea behind App Bundles is reducing the size of apps by only including the resources needed by the downloading device (in the past, APKs were device agnostic and simply contained everything). The implementation, while open in theory, is butchered badly and one of the design goals of the new format seems to be to make sideloading as difficult as possible.
That being said, since v4.4, Raccoon is able to download bundled apps. However, due to the nature of the new format, installation is only possible via USB cable (that is, you must have ADB installed), you'll need to enable premium features for that.