The source files could not be found by the Deployment Image Servicing and Management (DISM) tool.

Because this package is specific to the version of Windows you are running (e.g., Windows 10 version 22H2 or Windows 11), downloading it from unofficial third-party sites is due to security risks and compatibility issues.

Once you have acquired the microsoft-windows-netfx3-ondemand-package.cab file, follow these steps to install it via the Command Prompt (DISM). Step 1: Place the File

If the installation still fails, try running the following commands to repair your system image:

: A package built for an older Windows build will corrupt your current operating system files.

Double-click the ISO file to it as a virtual drive in Windows Explorer.

The safest way to get the exact CAB file for your system is to use a matching Windows installation ISO image. This method ensures that the file versions are perfectly compatible with your operating system, which is crucial for avoiding installation errors.

It is safest to extract the file from a legitimate Windows ISO downloaded via the Microsoft Media Creation Tool. Can I use the same CAB file for Windows 10 and 11?

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For Windows 10 and Windows 11, you cannot simply double-click a CAB file to install it. You must use the DISM (Deployment Imaging Servicing and Management) tool via an elevated Command Prompt.

Double-click the downloaded Windows ISO file to it as a virtual drive (e.g., Drive E: ).

How to Download and Install Microsoft Windows NetFx3 OnDemand Package

Method 1: Get the Genuine Package from the Official Windows ISO (Recommended)

This error typically indicates a version mismatch between the CAB file and your operating system. You cannot, for example, use a CAB file from Windows 10 version 2004 to install .NET 3.5 on Windows 10 version 22H2. The solution is to obtain a CAB file from an ISO that precisely matches your Windows OS build and version.

Run the following command to install the package, as documented here :

Method 1: Extract the Package from the Official Windows ISO (Best Offline Method)

Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU . Set UseWUServer to 0 .