Now game have really dark atmosphere. Original RE4-2007 mod was done by Wizard. I did new version (for RE4-2014) from scratch How to install: Copy into "***\Resident Evil 4\BIO4" (search for this in Steam folders). DON'T FORGET TO DO A BACKUP!
Castle part, it's the second part of the game. You needn't download other parts if you won't install other parts.