- rollback the .NET Framework to version 4.5.x
- install some software
- restore the just removed versions of .NET.
In order to accomplish this the following PowerShell script was developed based on How to: Determine which .NET Framework versions are installed. The script file was named Get-DotNetVersion.ps1 and is implemented as follows:
<#
https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed
To rollback from .NET Framework 4.7.2 (a.k.a. version 461808) on Windows Server 2012 R2 uninstalle the update:
KB4054566 Microsoft .NET Framework 4.7.2 for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2
#>
[string] $dotNetPath = 'HKLM:SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full'
[int] $dotNetVersion = (Get-ItemProperty $dotNetPath).Release
if ($dotNetVersion -ge 528040) {
Write-Host '4.8 or higher'
}
elseif ($dotNetVersion -ge 461808) { Write-Host '4.7.2' } elseif ($dotNetVersion -ge 461308) { Write-Host '4.7.1' } elseif ($dotNetVersion -ge 460798) { Write-Host '4.7' } elseif ($dotNetVersion -ge 394802) { Write-Host '4.6.2' } elseif ($dotNetVersion -ge 394254) { Write-Host '4.6.1' } elseif ($dotNetVersion -ge 393295) { Write-Host '4.6' } elseif ($dotNetVersion -ge 379893) { Write-Host '4.5.2' } elseif ($dotNetVersion -ge 378675) { Write-Host '4.5.1' } elseif ($dotNetVersion -ge 378389) { Write-Host '4.5' }
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