Unable to find version '3.5.1404.0' of package 'Unity' using NuGet.exe command line download

Mar 18, 2015 at 9:22 PM
I'm using NuGet.exe v2.8.3 with Visual Studio 2012. I installed Unity v3.5.1404.0 successfully through NuGet package installer inside Visual Studio. However, when I try to download the Unity package from a build script that runs outside the VS 2012 using MSBuild command line, I got the following error:
~.nuget\NuGet.targets(95, 9): Unable to find version '3.5.1404.0' of package 'Unity'

What would be the Package Source path for downloading Unity? I'm using custom feed in NuGet.targets.