This mod removes the dream filter (the filter that makes the image blur out in some parts of the game). Files are included for all 3 Penumbra games.
Simply extract the contents of the archive to the relevant folder. The folder structure is already organised in line with the game, so all you have to do is extract it to the relevant folder, and it should work. As Requiem is in Black Plague's folder as an expansion, installing the mod for Black Plague will also affect Requiem if you have it installed. If for some reason you want to install just for Black Plague or Requiem, the folders that affect them are /Penumbra Black Plague/maps for Black Plague, and /Penumbra Black Plague/expansion01/maps for Requiem. Extract the files accordingly.
Warning: this overwrites game files. If you want to restore the original at any point, please back the files up first.