Windows PowerShell 4.0 is part of the Windows Management Framework 4.0, which includes the following:
Windows PowerShell 4.0 available
Windows Server 2012 R2
Windows Server 2012
Yes, part of WMF 4.0
.NET 4.5 (built-in)
No, user must upgrade to Windows 8.1
Windows Server 2008 R2
Windows Server 2008 R2 SP1
Windows 7 SP1
Installation succeeds even if .NET 4.5 is not installed
Scenario: Installing WMF 4.0 on a computer that is not running .NET Framework 4.5 will report that the installation is successful, but the components of WMF 4.0 (such as Windows PowerShell, WMI, etc.) will not be updated.
Solution: Install .NET Framework 4.5, and then run the WMF 4.0 installer again.
There are known compatibility issues with several Microsoft server-class applications:
WMF 4.0 Release Notes for more information.
Update is available that prevents the PSModulePath environment variable from being reset when you upgrade WMF 3.0 to WMF 4.0 and then uninstall WMF 4.0 in Windows
Update prevents the “PSModulePath” environment variables from being reset after you uninstall WMF 4.0 in Windows