A more significant "extra" file has emerged in recent Windows builds, starting with Windows 11 version 24H2. Users attempting an offline installation of .NET Framework 3.5 found that the command would fail with the error 0x800f081f - CBS_E_SOURCE_MISSING . The solution was to place an file called DesktopDeployment.cab right alongside the Microsoft-Windows-NetFx3-OnDemand-Package.cab in the sxs folder. For a successful installation, both files must be present, making DesktopDeployment.cab a necessary 'extra' companion for modern Windows versions.
Inside this folder, you will find a file named: microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab Microsoft-windows-netfx3-ondemand-package.cab -Extra
: If you mount a Windows ISO, the file is typically located in the \sources\sxs directory. A more significant "extra" file has emerged in
: Your CAB file is for the wrong build of Windows. For example, you took a CAB from a Windows 10 2019 ISO and are trying to install it on Windows 11 24H2. For a successful installation, both files must be
If you have mounted a Windows ISO file, the .NET 3.5 payload is not stored as a single .cab file on the root. Instead, it is located within the installation sources. The path usually looks like this: D:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab (Where D: is the drive letter of the mounted ISO)
folder of the original Windows installation media. He dug through his desk until his fingers brushed a dusty USB drive labeled Server 2019 . He slid it into the machine, the drive letter appearing with a soft chime.
Net Framework 3.5 (offline) installation failure is not detected