Download Powershell 5.1 - For Windows Server 2012 R2

$PSVersionTable Expected output snippet:

$PSVersionTable.PSVersion If the output shows Major 5 and Minor 1 , you already have it. Otherwise, proceed. download powershell 5.1 for windows server 2012 r2

wusa.exe "C:\path\to\Win8.1AndW2K12R2-KB3191564-x64.msu" /quiet /norestart For automatic reboot: $PSVersionTable Expected output snippet: $PSVersionTable