Here is a link to the Git
https://github.com/Nidre/VS2015-Dark-Npp/
Installation
Right Click HERE and select Save As to download the theme.
Go to %APPDATA%\Notepad++.
Open themes folder, create a new folder named themes if it doesn’t exists.
Place downloaded .xml file inside the folder.
Restart Notepad++.
Open Settings->Style Configurator.
Select VS2015-Dark from the theme drop-down box.
Click Save & Close