, always keep a copy of your Windows version's ISO handy, as it contains all "Features on Demand" (FOD) packages needed for offline repairs and upgrades.
Run this command:\text{dism /online /enable-feature /featurename:NetFX3 /all /Source:D:\sources\sxs /LimitAccess} /Source : Points to the folder containing the .cab file.
Inside that folder, you will find microsoft-windows-netfx3-ondemand-package.cab . Microsoft-windows-netfx3-ondemand-package.cab Download
If you are in an "air-gapped" environment (no internet) or dealing with a PC that has Windows Update restricted by group policy, you need the .cab file. Where to Download the .NET 3.5 CAB File
These usually mean DISM cannot find the source file. Double-check that your /Source path is exactly where the .cab file is located and that the file name matches exactly. , always keep a copy of your Windows
Type the following command (replace the path with your actual file location):\text{dism.exe /online /add-package /packagepath:"C:\temp\microsoft-windows-netfx3-ondemand-package.cab"} Press . Wait for the progress bar to reach 100%. Method 2: Using the Windows ISO (Recommended)
If you have the Windows 10 or 11 ISO, mount it. Navigate to the \sources\sxs folder. If you are in an "air-gapped" environment (no
While many tech forums host this file for direct download, always verify the file hash or scan it for malware. Using the file from your official Windows ISO is the only 100% secure method. How to Install the .NET 3.5 CAB File (Step-by-Step)
Ensure the .cab file matches your Windows version. A .cab from a Windows 10 ISO may not work on a Windows 11 installation.
If you have mounted your Windows ISO to drive letter D: , you don't even need to move the file: Open .