Download WMF 5.1 to a Windows Server 2008 R2 system
This also works with Windows Server 2012 and 2012 R2. By default Windows Server 2016 already has PowerShell 5.0 installed, so this is not required there. Note that to upgrade Windows Server 2008 R2 you must be using Service Pack 1 (SP1).

First we’ll confirm the verison of PowerShell on our 2008 R2 system. This can be done by opening PowerShell, and running $PSVersionTable, as shown below.

PS C:> $PSVersionTable

Name Value
—- —–
CLRVersion 2.0.50727.4927
BuildVersion 6.1.7600.16385
PSVersion 2.0
WSManStackVersion 2.0
PSCompatibleVersions {1.0, 2.0}
SerializationVersion 1.1.0.1
PSRemotingProtocolVersion 2.1
As expected we have PowerShell version 2.0, which is the default in this operating system.

WMF 5.0 or higher is needed to provide the just-enough administration (JEA) PowerShell feature implemented in Windows Server 2016 into the older 2008 R2 SP1 operating system.

Before we download and install WMF though, we must first install .NET Framework 4.5.2 or later, as this is a prerequisite for WMF 5.1 in Windows Server 2008 R2 SP1, and by default 2008 R2 SP1 comes with .NET 3.5. You can download a newer version of .NET from here: https://www.microsoft.com/net/download/framework

After installation has completed you’ll need to perform a system reboot to proceed.

Next download Windows Management Framework (WMF) 5.1 from Microsoft: https://www.microsoft.com/en-us/download/details.aspx?id=54616

A system reboot is not required after installing WMF.

Once installed open PowerShell and run $PSVersionTable again, we can now see that PSVersion is listed as 5.1 as expected.

PS C:> $PSVersionTable

Name Value
—- —–
PSVersion 5.1.14409.1005
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
BuildVersion 10.0.14409.1005
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
We will now be able to configure our Windows Server 2008 R2 SP1 system to use just-enough administration (JEA), as we’ll cover in future posts.

Summary
By first updating the .NET Framework and then installing either WMF 5.0 or 5.1, we can upgrade our PowerShell version to support Just-Enough Administration (JEA) in older versions of Windows, such as Windows Server 2008 R2, 2012, and 2012 R2.