As I understood it there was supposed to be a Stand-alone (boxed) version and R3E DLC version, it seems as with most other features in the game they haven't quite finished the box version and so they have only released the incomplete, Pre-Alpha, Alpha, Beta or whatever you want to call it version!
Are you sure about that and if so what is the point of that, you buy it on DVD and then have to download it anyway?, the DVD version isn't available at the moment anyway though is it?
Unfortunately I'm not 100% sure. I really can't speak for the publisher.
There is a physical version either out in Germany or on the way ( My guess, it will probably be Germany only). But what it contains or will contain can be subject to change so my previous post shouldn't be taken as an official confirmation.
It includes: "Inhalt: DVD Box DTM Demo + Bedienungsanleitung in Deutsch + Aktivierungscode Vollversion" which is: the demo of that game on DVD, a manual in German, and the activation code for the full game.