PowerShell version 5.1 for Windows 7

PowerShell version 5.1 is available for Windows 7 and Windows Server 2008 R2.

https://blogs.msdn.microsoft.com/powershell/2017/01/19/windows-management-framework-wmf-5-1-released/

http://www.microsoft.com/en-us/download/details.aspx?id=54616