Disable "Screen Space Ambient Occlusion" (SSAO) in the video settings. The HD specular maps don't play nicely with the old SSAO implementation.
, an HD texture pack aims to revitalize its 2013 visuals by replacing original low-resolution assets with higher-fidelity versions, enhancing environmental details, character models, and lighting effects. Overview of Splinter Cell: Blacklist Visuals
If you are doing a stealth marathon this winter, do not play the vanilla version. Install this mod, crank up the dynamic lighting, and remember what it felt like to be the greatest spy America never had.
Essential.