On some configurations my upscaled texture mod will cause corpse textures to load in black. If that happens these slightly less heavily scaled textures should help fix the issue
Extract to \Penumbra Black Plague\redist\models\corpse and overwrite the original textures. These corpse textures are 2048x2048 instead of 4096x4096, and should reduce the memory demands on the game engine a bit.
Refer to my Penumbra: Black Plague Upscale Mod for more information on the full upscaled texture pack