Did it come with a readme?
Mods have all types of little ins and outs.
Please conduct an experiment. extract again to a folder on your desktop. You can delete after the experiment.
If you see a modtag at the end of the filename, then the mod has appearance restricted to a scenario that has the same modtag.
generic....
filename [modtag].bmp
example...
smod german lw soldier [peadot].bmp
scenario must have the modtag [peadot] so soldiers of the filename's type will display the mod
some mods have NO modtag, every German will wear those cool modded helmets maybe.
But if no modtag, it could still be connected to weather or season or region.