NSight installation fails on Visual Studio 2015 DirectX installation

I am trying to install NSight onto Visual Studio 2015 Pro (standalone machine without internet connectivity). Each time I try to install, it fails installing DirectX redistributables saying the installation package was corrupt. I have re-downloaded the installer multiple times, trying the installation on a build on a laptop with internet connectivity successfully, but fails on the machine without.

Does anyone know if NSight or Visual Studio 2015 require internet connectivity to use? Or any idea of why this could be happening? I am at a loss.

For nsight visual studio edition, there is a different forum here for that where you may wish to ask this: