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The exact same .cab file from a Windows 11 ISO works perfectly. The DISM command is identical across both OS versions.

Disclaimer: This article focuses on troubleshooting Windows features. Always ensure you have appropriate backups before modifying system files. If you'd like, I can: Show you where to download the from Microsoft.

Your current (e.g., Windows 11 23H2) The exact error code displayed if the installation failed

Once you have the CAB file saved locally, you will use . Do not double-click the CAB file; Windows cannot natively "run" it.

Generally, yes, the .cab files from the corresponding OS version's sources\sxs folder are interchangeable for installing .NET 3.5.

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

Windows couldn't connect to the internet to download source files.

Note: If you renamed the file to netfx3.cab or placed it elsewhere, modify the path accordingly.