How to Install .NET Framework 3.5 Offline Using the microsoft-windows-netfx3-ondemand-package.cab File for Free
You may find blogs and forums offering direct download links to the CAB file through file-sharing services like Baidu Pan, Quark, or others. While some users report success with these, . The file itself is not inherently dangerous, but you have no guarantee that the downloaded file hasn't been tampered with. Whenever possible, obtain the CAB file from Microsoft directly.
You can skip the download and install it "On-Demand" using the . You can find this file for free in any Windows 10 installation media under the sources\sxs folder.
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If you have ever tried to install older software or games on Windows 10 or Windows 11, you have likely hit the dreaded "Requires .NET Framework 3.5" error. While Windows usually offers to download this feature online, that doesn’t help if your internet is slow, unreliable, or if you are managing dozens of offline PCs.
You do not need to pay for or download this file from untrusted third-party websites, which often bundle malware or altered configurations. You can extract it from official Microsoft installation media that you likely already own.
One of the most efficient, solutions to this problem is using the microsoft-windows-netfx3-ondemand-package.cab file. This guide explains what this file is, why it is essential, and how to use it to install .NET Framework 3.5 offline, resolving common errors. What is Microsoft-Windows-NetFx3-OnDemand-Package.cab? How to Install
Users of the latest Windows 11 Insider builds or recent stable releases (such as 27982.1) have reported that Microsoft has removed .NET 3.5 support more aggressively. In these cases, the standard DISM commands may fail even with the correct CAB file.
This is the most reliable method because the CAB file will perfectly match your Windows version and language.
⚠️ Avoid random “DLL download” sites or YouTube descriptions offering direct CAB links. Always verify the digital signature of the file before installing. Whenever possible, obtain the CAB file from Microsoft
DISM /Online /Add-Package /PackagePath:"C:\NETFX3\microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab" Use code with caution.
You do not need to pay for this file. It is included with the official Windows installation media. 1. The Official Source (ISO/DVD)
: The most reliable way is to mount a Windows ISO (matching your specific Windows version) and navigate to the \sources\sxs Media Creation Tool : You can download a fresh ISO for Windows 10 Windows 11 Microsoft Media Creation Tool Standalone Installer
While not always required, restarting ensures that all components are properly registered. After reboot, verify the installation by opening . The checkbox for ".NET Framework 3.5 (includes .NET 2.0 and 3.0)" should be checked.
Best of all, it is . No subscriptions. No ads. No malware.