The .cab file method is the most efficient and reliable way to install the .NET Framework 3.5 offline or in corporate environments. By utilizing the DISM /Source command, you can quickly bring your Windows 10/11 system up to date with the necessary legacy application support.
Type or copy-paste the following command into the elevated Command Prompt window. If you used a different folder name in Step 1, modify the path accordingly:
If your environment utilizes PowerShell for automation and configuration management, you can use the Add-WindowsPackage cmdlet to achieve the same result. Open with administrative privileges.
For developers and IT professionals intending to deploy .NET Framework 3.5 across multiple machines: cab file for .net framework 3.5
dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess Use code with caution. Breakdown of the Command /online : Tells DISM to target the running operating system.
Why .NET 3.5 is needed (legacy apps, SQL Server, etc.) and the limitation of online installation in air-gapped environments.
Note: If your CAB file has a simplified name, ensure the command matches the exact file name inside your directory, like so: If you used a different folder name in
This can happen if you try to add a package that is already partially installed or if there's a mismatch.
Installing the Microsoft .NET Framework 3.5 on modern Windows systems (Windows 10, Windows 11, and Windows Server 2016-2022) can sometimes be problematic. Because this framework is an older version, it is no longer enabled by default. While you can try downloading it, the best method for offline machines or systems with restricted internet access is using the located on your Windows installation media.
Now, users can simply check the .NET 3.5 box in Windows Features, and Windows will automatically pull the CAB from your file server without hitting the internet. Breakdown of the Command /online : Tells DISM
💡 The .cab file is the essential "offline" source for .NET 3.5, usually found in the /sources/sxs folder of Windows installation media. If you're trying to fix a specific error, tell me: What Windows version are you on? Are you getting a specific error code ? Do you have the original install media (ISO)? I can give you the exact DISM command to solve it.
Complete Guide: Installing .NET Framework 3.5 Using the CAB File