With PowerShell: Install-WindowsFeature NET-Framework-Core. Using DISM: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All. Via Server Manager: Add roles and features -> Features ->. On Windows Server 2022, 2019, 2016, and 2012 R2, you can install NET Framework 3.5 in several ways: Get-ChildItem 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP' -Recurse | Get-ItemProperty -Name version -EA 0 | Where | Select PSChildName, version NET Framework that are installed on your computer: Get-WindowsCapability -Online -Name NetFx3~~~~ Name : NetFX3~~~~ĭisplayName. NET Framework is successfully installed, run the command: Net 3.5 from the component source files on the installation disk, use the command:ĭISM /online /enable-feature /featurename:NetFX3 /All /Source:E:\sources\sxs /LimitAccessĪdd-WindowsCapability -Online -Name NetFx3~~~~ -Source E:\Sources\SxS In my case, the virtual drive with the image was assigned the drive letter E: (we will use this drive letter in the following commands). Click on the file and choose Mount to connect the image to a virtual DVD drive (or use the PowerShell command: Mount-DiskImage -ImagePath "C:\ISO\Windows11-22h2.iso" ) In my case, I have the file Windows 11 ISO image file. Connect your media with the Windows installation image to your computer. To do this, you will need an installation USB flash drive or an ISO image file with your Windows version ( how to check the version of Windows in an ISO image): In this case, you can manually install the NET 3.5 feature from your Windows installation media. 
Please reboot your computer and try again
NET 3.5: Windows couldn’t complete the requested changes. If your computer is not connected to the Internet or disconnected from the network, then an error will appear when installing. Or with PowerShell: Enable-WindowsOptionalFeature -Online -FeatureName "NetFx3".Using DISM: DISM /online /Enable-Feature /FeatureName:"NetFx3".
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