Maybe the bonus files just contains the PDF manual and maps.Try installing what you can find.The main file probably has what you need .If you have a loading screen with a U-boat and you see 1.5 on the main menu screen then you have what you need.
If D2D got taken over I am not sure what you can do and you'd have to have a way to show that you purchased the game from them.You could try support.
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