Microsoft-windows-netfx3-ondemand-package.cab -extra Link

: When installing .NET Framework 3.5, it is crucial that the architecture of the CAB file matches your operating system. Using a 32-bit (x86) CAB file on a 64-bit (amd64) system will cause the installation to fail with an error indicating the package is not applicable.

Wrap your file path in quotation marks to account for spaces in folder names. Move the file directly to the root directory (e.g., C:\ ) to simplify the path. To help narrow down any issues, tell me: What version of Windows are you targeting?

.NET Framework 2.0 SP2, .NET Framework 3.0 SP2, and .NET Framework 3.5 SP1 Where to Find the Official .CAB File Microsoft-windows-netfx3-ondemand-package.cab -Extra

The file is legitimately included on your Windows installation media (USB drive or ISO file).

mkdir C:\NetFX3_Extra

The presence of this file usually signals a specific problem:

dism /online /add-package /packagepath:"D:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab" : When installing

Then manually copy the extracted CAB contents to: C:\Windows\WinSxS\

: These usually mean Windows cannot find the source file. Double-check that the path points exactly to the folder containing the Version Mismatch : Ensure the Move the file directly to the root directory (e