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

If you’ve ever tried to install older software (like AutoCAD 2016, SQL Server 2014, or legacy ERP tools) on Windows 10 or Windows 11, you’ve likely encountered the dreaded error: “.NET Framework 3.5 includes .NET 2.0 and 3.0.”

The recommended solution often involves pointing Windows to a file called Microsoft-Windows-NetFx3-OnDemand-Package.cab. But what is this file, and how do you use it safely? Let’s break it down.

Cause: Windows cannot locate or verify the CAB file signature. Download Microsoft-windows-netfx3-ondemand-package.cab

Solutions:

Move the downloaded file to a simple path. We are going to use C:\temp to keep things easy for the command line. If you’ve ever tried to install older software

The safest source is your own Windows installation media.

  • Mount the ISO (double-click it). Note the drive letter, e.g., D:\. Mount the ISO (double-click it)

  • Navigate to: D:\sources\sxs\

  • Inside the sxs folder, you will find the file named exactly:
    microsoft-windows-netfx3-ondemand-package.cab

    (On some builds, it may be microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab)

  • Copy that .cab file to a convenient location, e.g., C:\temp\

    • Add-WindowsPackage -Online -PackagePath "C:\temp\microsoft-windows-netfx3-ondemand-package.cab"
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