Download Microsoft-windows-netfx3-ondemand-package.cab ~upd~

dism /image:C:\ /add-package /packagepath:"%DEPLOYROOT%\Drivers\netfx3.cab"

Run the following command (replace C:\netfx3\ with the actual path where you saved the .cab file):

The download hit 45%. An eternity passed.

/LimitAccess : Prevents DISM from trying to contact Windows Update. Download Microsoft-windows-netfx3-ondemand-package.cab

4 minutes

In the command prompt window, type or copy/paste the following command. Make sure to replace C:\NetFx3.cab with the full path to your CAB file.

This issue occurs because Windows needs the specific .cab (cabinet) file containing the necessary framework binaries, but cannot download them from Windows Update. The file in question is Microsoft-Windows-NetFx3-OnDemand-Package~31bf3856ad364e35~amd64~~.cab . 4 minutes In the command prompt window, type

Absolutely. That is one of the main reasons to use the offline CAB method.

Get-WindowsFeature -Name NET-Framework-Core

We’ve all been there. You try to install an older application (or a game) on Windows 10 or 11, and you get the dreaded popup: "This app requires .NET Framework 3.5." Follow the DISM steps above

This method adds the CAB file directly as a package and is sometimes more effective when encountering persistent errors.

While Windows 10 and Windows 11 come with the newer .NET 4.x or 5+ versions out-of-the-box, older programs rely heavily on the 3.5 runtime. When you try to enable it, Windows may attempt to fetch the files online, only to be met with errors like 0x800f081f or 0x800F0954 .

Here is the step-by-step guide to getting .NET 3.5 working again in under 5 minutes.

The Microsoft-windows-netfx3-ondemand-package.cab is a file. Its story is one of compatibility bridging old software to new operating systems. Always obtain it from a Microsoft Windows ISO or Microsoft Update Catalog. Never trust third-party downloads. Follow the DISM steps above, and you’ll enable .NET 3.5 safely.

Open .