While many sites claim to offer a "free link" for the microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab file, downloading random CAB files from third-party sources is a significant security risk. These files often serve as the foundation for .NET Framework 3.5, which is essential for running older software on modern Windows systems.
The safest and most reliable way to get this package is directly from Microsoft or your official Windows installation media. What is the NetFx3 On-Demand Package?
This specific CAB file is the payload for .NET Framework 3.5 (which includes .NET 2.0 and 3.0). Windows 10 and 11 don't install this by default to save space, instead offering it as a "Feature on Demand." Method 1: The Recommended "Free" Way (Windows Features)
Before hunting for a download link, try the built-in method. It downloads the necessary files directly from Windows Update. Press Win + R, type optionalfeatures.exe, and hit Enter.
Check the box for .NET Framework 3.5 (includes .NET 2.0 and 3.0).
Click OK and select Let Windows Update download the files for you. Method 2: Using Your Windows ISO (No Internet Needed)
If you are offline or getting errors like 0x800F0906, you can extract the CAB file from a Windows ISO.
Mount your Windows ISO (right-click the file and select Mount). Note the drive letter (e.g., D:). Navigate to D:\sources\sxs.
You will see the file microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab right there.
To install it, open Command Prompt as Administrator and run:Dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess Method 3: Official Microsoft Download Center
If you need the installer for a different environment, use the official .NET Framework 3.5 Service Pack 1 (Full Package) available on the Microsoft website. This is the only "link" you should trust to avoid malware. Why Avoid Third-Party "Free Download" Links? microsoftwindowsnetfx3ondemandpackagecab download free link
Malware Injection: CAB files can be tampered with to include backdoors.
Version Mismatch: Using a CAB file from a different Windows build (e.g., trying to use a Windows 1809 file on a 22H2 system) can cause system instability or "Assembly not found" errors.
Corrupt Files: Unofficial mirrors often host incomplete files that fail during the DISM injection process.
Pro Tip: If you're a system administrator, you can also download these packages via the Volume Licensing Service Center (VLSC) or the Microsoft Evaluation Center as part of the "Languages and Optional Features" ISO.
Are you getting a specific error code like 0x800F081F while trying to install this?
microsoft-windows-netfx3-ondemand-package.cab is a legitimate Microsoft cabinet file used to install .NET Framework 3.5 offline on Windows 10, Windows 11, and Windows Server Microsoft Learn Review of Download Sources no direct, standalone official download link for just the
file on Microsoft's public download site. Microsoft instead bundles this file within the official Windows installation media Microsoft Learn Official Method (Free & Safe): You can obtain this file for free by downloading the Windows Media Creation Tool to create a Windows ISO Microsoft Learn . Once the ISO is mounted, the file is located at \sources\sxs\ on the virtual drive Microsoft Learn Third-Party "Free Links": Many sites (like or various file-sharing links) offer the file as a standalone download Quick access without downloading a multi-GB ISO. High security risk of malware. Additionally, version-specific
; a file from Windows 10 version 1909 will likely fail on version 22H2 How to Use the File Once you have the file, you can install it using the Deployment Image Servicing and Management (DISM) tool via an Administrator Command Prompt Microsoft Learn
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:"C:\Path\To\SXS" "C:\Path\To\SXS" with the actual folder path where the file is stored. Recommendation
Do not use unofficial download links for system files. If you have an internet connection, the easiest way to install .NET 3.5 is through "Turn Windows features on or off" While many sites claim to offer a "free
The microsoft-windows-netfx3-ondemand-package.cab file is a Feature on Demand (FOD) package used to install .NET Framework 3.5 (which includes .NET 2.0 and 3.0) on Windows 10, Windows 11, and Windows Server. 1. Official Download Methods
Microsoft does not provide a direct standalone web link for this specific .cab file because it is version-specific; the file from one Windows version (e.g., v1909) will not work on another (e.g., v2004). You can obtain the correct version for your system through these official channels:
Windows Installation Media (Recommended Offline Method):The file is located on your Windows ISO or installation USB in the \sources\sxs directory.
How to get it: Use the Windows 10 Media Creation Tool or Windows 11 Download Page to download the ISO, mount it, and navigate to the sxs folder.
Windows Update (Online Method):If you have internet access, you do not need to download the .cab file manually.
Search for "Turn Windows features on or off" in the Start menu.
Check the box for .NET Framework 3.5 (includes .NET 2.0 and 3.0). Select "Let Windows Update download the files for you".
Standalone Offline Installer:Microsoft offers a general offline installer (roughly 231 MB) that works for most systems, though newer Windows 11 builds (26H1/Build 28000+) strictly require the specific standalone installer. Download .NET Framework 3.5 SP1 (Full Package). 2. How to Install Using the .cab File
If you already have the microsoft-windows-netfx3-ondemand-package.cab file, use the Deployment Image Servicing and Management (DISM) tool to install it: Copy the .cab file to a folder (e.g., C:\temp). Open Command Prompt as an Administrator.
Run the following command (replace the path with your actual file location): Title: Download Microsoft
dism /online /add-package /packagepath:"C:\temp\microsoft-windows-netfx3-ondemand-package.cab" Use code with caution. Copied to clipboard Source: Woshub - How to Install .NET Framework 3.5. 3. Troubleshooting Common Errors
Error 0x800F0954: Often occurs when a computer is configured to use a local WSUS server instead of Windows Update. Temporarily bypassing WSUS in the registry or using the /Source parameter with installation media can fix this.
Error 0x800F081F: This indicates the source files could not be found. Ensure the .cab file version matches your current Windows Build exactly.
If you tell me your Windows version and build number (type winver in Start), I can confirm the exact installation method recommended for your specific system. Where to find microsoft-windows-netfx3-ondemand-package.cab
If you have a legitimate Windows ISO (downloaded via the Media Creation Tool), you do not need a separate download link. The CAB file lives here:
D:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab.Pro Tip: If your ISO is for a different edition (e.g., N edition), the CAB file still works for all editions except KN (Korea).
Yes, completely. The microsoft-windows-netfx3-ondemand-package.cab is an original Microsoft component. Downloading it from a trusted source is not piracy; it is simply redistributing a system feature that Microsoft makes available to Windows license holders.
However, a word of caution: Do not download CAB files from random file-hosting websites (e.g., Mediafire, RandomUpload.net). These could be bundled with malware or outdated versions that break your system.
Below, we provide verified, official sources.
.cab.Many legacy and enterprise applications (such as older accounting software, utilities, and specific drivers) require the .NET Framework 3.5 to function.
When a user attempts to enable .NET 3.5 via the "Turn Windows features on or off" menu, Windows attempts to download the files from Windows Update. However, this process often fails due to:
In these scenarios, having the .cab file locally is the only reliable solution.