Start by downloading .NET 4.6.1 from Microsoft. Launch the installer – I typically do this by running the command

c:tempNDP461-KB3102436-x86-x64-AllOS-ENU.exe

from an elevated PowerShell. Accept the licensing agreement and wait….

Check Version(s) of .NET Installed
From an elevated PowerShell run the following set of commands:

Get-ChildItem 'HKLM:SOFTWAREMicrosoftNET Framework SetupNDP' -recurse |

Get-ItemProperty -name Version,Release -EA 0 |

Where { $_.PSChildName -match '^(?!S)p{L}'} |

Select PSChildName, Version, Release, @{

  name="Product"

  expression={

      switch($_.Release) {

        378389 { [Version]"4.5" }

        378675 { [Version]"4.5.1" }

        378758 { [Version]"4.5.1" }

        379893 { [Version]"4.5.2" }

        393295 { [Version]"4.6" }

        393297 { [Version]"4.6" }

        394254 { [Version]"4.6.1" }

        394271 { [Version]"4.6.1" }

      }

    }

}