1. Copy the Zenburn_Darker-v2.xml file inside %appdata%\Notepad++\themes\ and restart notepad++.
2. Be also sure to switch theme: Settings -> Style Configurator... -> Select theme: Zenburn_Darker -> Save & Close

Note: color list:

general
3F3F3F -> 1F1F1F
FFCFAF -> FF9980
DFC47D -> FEB183
CEDF99 -> E4E792
8CD0D3 -> 7EE0DE
CC9393 -> DC8383
9F9D6D -> 808040
C89191 -> DC8383
DCA3A3 -> DC8383
E3CEAB -> FEB183
diff only
CFBFAF -> FF0000
FEB183 -> 00FF40

Result:

And for diff patch files: