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I am trying to install Windows Powershell 4.0. I use Windows 7 SP1 OS (x64 Bit).

I have downloaded & installed below packages already.

  1. .NET Framework 4.5. (NDP451-KB2858728-x86-x64-AllOS-ENU.exe)
  2. Windows Management Framework 4.0. (Windows6.1-KB2819745-x64-MultiPkg.msu)

Both the packages got installed without giving any error however when I go to Powershell prompt & type the following:

powershell -version 4

It throws an error:

Cannot start Windows PowerShell version 4 because it is not correctly installed.

techraf
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SDG
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    Have you rebooted? You don't get prompted, but part of the update will not be applied until you reboot. – Zoredache Apr 29 '14 at 05:52
  • yes, I rebooted after both installation. – SDG Apr 29 '14 at 05:57
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    You have installed .NET Framework 4.5.1. Have you tried installing 4.5? Maybe version 4.5.1 is not compatible with Powershell V4. Check the currently running version of Powershell checking $PSVersiontable variable values. – Trinue Apr 29 '14 at 06:31
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    Hi, Trinue, Bingo!! I have uninstalled .NET Framework 4.5.1 & Windows Management Framework 4.0 & installed .NET Framework 4.5 (dotnetfx45_full_x86_x64.exe) & re-installed WMF 4.0. And rebooted the computer. This time I saw Windows Update was running & it was updating OS. I knew that it was going well. Now I have Powershell 4.0 installed in my computer. If I type $PSVersionTable. It will return the result as: PS C:\Users\Admin> $PSVersionTable ---- ----- PSVersion 4.0 So, many many thanks for your help. – SDG Apr 29 '14 at 07:47
  • That should be posted as the answer. That's exactly what the solution is. – Adi Inbar Sep 05 '14 at 17:28

1 Answers1

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It looks like is .NET Framework 4.5.1 not compatible with Powershell V4. So, I have uninstalled .NET Framework 4.5.1 and Windows Management Framework 4.0. Then I installed .NET Framework 4.5 (dotnetfx45_full_x86_x64.exe) & re-installed WMF 4.0. And rebooted the computer. This time I saw Windows Update was running & it was updating OS. I knew that it was going well.

Now I have PowerShell 4.0 installed in my computer. If I type $PSVersionTable it will return the result as: 

PS C:\Users\Admin> $PSVersionTable

----        -----
PSVersion   4.0
StackzOfZtuff
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masegaloeh
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  • Is there any verification from an authoritative source that there's a compatibility issue between .NET 4.5.1 and WMF 4.0? If so, it would be helpful to have a link added to the answer. I was unable to duplicate the stated problem on Server 2008 R2 SP1. Installing NDP451-KB2858728-x86-x64-AllOS-ENU.exe, then Windows6.1-KB2819745-x64-MultiPkg.msu, then performing a reboot resulted in a working PowerShell v4 installation. – bshacklett Feb 05 '15 at 16:06
  • It may have been [this issue](http://blogs.msdn.com/b/powershell/archive/2013/10/29/wmf-4-0-known-issue-partial-installation-without-net-framework-4-5.aspx), where the installation was simply incomplete somehow. – Bacon Bits Mar 08 '15 at 18:54