Error: 0x800F0954. The source files could not be found.
DISM.exe /Online /Add-Package /PackagePath:"C:\Temp\Microsoft-windows-netfx3-ondemand-package.cab"
Or the classic:
Once you have acquired the microsoft-windows-netfx3-ondemand-package.cab file, you can install it without an internet connection using the Deployment Image Servicing and Management () tool built into Windows. Prerequisites Download Microsoft-windows-netfx3-ondemand-package.cab
Modern Windows operating systems ship with newer versions of the .NET Framework (such as version 4.8 or .NET 6/8) pre-installed. However, the architecture of .NET 3.5 is entirely distinct. Newer editions are not natively backward-compatible with applications built specifically for the 3.5 ecosystem.
Once you have the file or the mounted media, use the tool to install it without an internet connection.
Installation 99%...
user wants a long article about downloading the "Microsoft-windows-netfx3-ondemand-package.cab" file. This is a technical topic related to installing .NET Framework 3.5 on Windows. I need to cover what it is, how to download it, installation methods, troubleshooting, and best practices. I'll search for relevant information. search results show various sources. I need to open some of them to gather detailed information. user's request has high authority requirements, I should prioritize using official Microsoft documentation for the main installation steps, and I can incorporate other technical sources for supplemental instructions. All the gathered information will be used to write a comprehensive article. I'll structure the article with an introduction, sections on what the file is, how to obtain it (from Windows installation media, Microsoft Update Catalog, etc.), installation methods (DISM, enabling feature, etc.), troubleshooting, best practices, and a conclusion. I'll cite the sources appropriately. Microsoft-windows-netfx3-ondemand-package.cab file is the official offline installer for on modern Windows operating systems, primarily Windows 10, Windows 11, and Windows Server 2016 and later.
Once the process finishes successfully, restart your computer. You can verify that .NET 3.5 is now active. Alternative: Installing from Windows ISO
The .NET Framework 3.5 is a software framework developed by Microsoft that provides a large library of pre-built functionality, support for various programming languages, and a virtual execution environment. It was released on October 1, 2007. The .NET Framework 3.5 builds on the .NET Framework 2.0, which was released in 2006, adding new features and components. Error: 0x800F0954
Many users attempting to run legacy software, games, or development tools on modern Windows 10/11 systems encounter errors (such as or 0x800f0906 ) when installing .NET Framework 3.5. This happens because Windows treats .NET 3.5 as an "On-Demand" feature that requires Windows Update to fetch the files.
dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess Use code with caution.