Just to confirm that I've successfully got the latest version of Lumia Camera on my Lumia 1020 running Creators Update.
1. First download the Nokia Camera xap from WindowsMania.pl
2. Copy it to your phone storage
3. Go to Files or File Explorer and install it from there ... wait min. or two, it will appear in the list
4. Don't run it. Open Store and check for updates. It should show up as Lumia Camera and immediately start downloading and installing. (After this if you check it under Store it will say that this app is not supported on this device but under this it will also say installed).
I got my DNG back. WooHooo