The .rar file contains the update installer and a "PLAZA" folder.
Run setup.exe and point it to the directory where the base game is installed. Lust.for.Darkness.Update.v20180719.rar
Minor adjustments to the "Mask" mechanic visibility and lighting effects to enhance the atmosphere without obscuring critical paths. Installation Notes Lust.for.Darkness.Update.v20180719.rar