Disable PowerShell v2 via GPO

I'm trying to disable the old v2 version of PowerShell via GPO but have not been successful.

I have tried everything, to run a Scheduled Task (running a PowerShell script which command inside DOES indeed work if run locally), which included copying the file on the local machine, to setting up a new Software Restriction Policy, but nothing works as that version of PowerShell stays enabled.

Any suggestions?

Assuming you have a requirement like this STIG:

Windows PowerShell 5.0 added advanced logging features which can provide additional detail when malware has been run on a system. Disabling the Windows PowerShell 2.0 mitigates against a downgrade attack that evades the Windows PowerShell 5.0 script block logging feature.

The fix is to disable the windows Feature. For example:

# Windows 10:
Disable-WindowsOptionalFeature -Online -FeatureName MicrosoftWindowsPowerShellV2Root

# Windows Server:
Uninstall-WindowsFeature -Name PowerShell-V2

Uninstalling should take a minute or so, then show you whether a restart is required for the change:

Uninstall-WindowsFeature PowerShell-V2

Success Restart Needed Exit Code      Feature Result                               
------- -------------- ---------      --------------                               
True    No             Success        {Windows PowerShell 2.0 Engine}    

# running the command again does not error:

Success Restart Needed Exit Code      Feature Result                               
------- -------------- ---------      --------------                               
True    No             NoChangeNeeded {}            

To check the current status:

# Windows 10
Get-WindowsOptionalFeature -Online -FeatureName MicrosoftWindowsPowerShellV2Root

FeatureName      : MicrosoftWindowsPowerShellV2Root
DisplayName      : Windows PowerShell 2.0
Description      : Adds or Removes Windows PowerShell 2.0
RestartRequired  : Possible
State            : Enabled
CustomProperties :

# Windows Server:
Get-WindowsFeature -Name PowerShell* 

Display Name                          Name           Install State
------------                          ----           -------------
[X] Windows PowerShell                PowerShellRoot     Installed
    [X] Windows PowerShell 5.1        PowerShell         Installed
    [X] Windows PowerShell 2.0 Engine PowerShell-V2      Installed  ## Should be "Available"
    [X] Windows PowerShell ISE        PowerShell-ISE     Installed