Check your mod folder structure then. When you unzip the "We_Dive_at_Dawn25x.zip" file, there are more archives inside of that. Each of those must be unzipped also. Therefore, you will have several mods that you'll need to move into that MODS folder. As an example, using WDAD, after drilling down into the folder structure, you should have
"C:\Games \Steam \steamapps \common \Silent Hunters Wolves of the Pacific \MODS \WDAD_v100 \Data..."
with a Support folder also in there. The patch then would be
"C:\Games \Steam \steamapps \common \Silent Hunters Wolves of the Pacific \MODS \WDAD_v100_Patch1 \Data..."
also with a Support folder. Once you have a good folder structure, then it should activate properly. Add the other mods as you want. There are also a few attempts from other modders to add to or enhance the mod, but I cannot find them right now... The most common problem is having two folders of the same name, or trying to use a "package" of mods' root folder, and the other mods are still below that.
