Yeah, this is a "bug" in his file structure. The file you need is there, only it's in the wrong place. If I remember correctly, you will find 512 and 1024 folders in your texture folder that aren't supposed to be there--the game doesn't go looking in them for textures. You need to move the file from the erroneous folder into the \Textures folder, and the problem is solved, if I remember correctly.
And he never goes back and fixes his mistakes once he uploads content....
Ay carumba, you really sound very judgemental there.
In the version of DNWeapons Complete that I have, the installation procedure is documented in the readme, so it can hardly be considered a "bug" that needs to be "fixed". PEBKAC!