Since Windows Management Framework was released Oct. 2009, our customers have been excited about using PowerShell 2.0 on down-level OSes. Meanwhile, we also received feedback from both internal and external customersabout our product issues. One of them is WMF install failure followed by the mysterious “The update does not apply to your system” error message. It is a blocking issue for some customers since they cannot get WMF successfully installed and the error message does not help much with a fix.
You can find details here.