: Prevents DISM from attempting to contact Windows Update over the internet.
Run the tool and select . Choose ISO file and save it to your computer. Once downloaded, right-click the ISO file and select Mount .
Once you have the file, follow these steps to install it using the Command Prompt. Prerequisites
It contains the necessary files to enable .NET Framework 3.5 (including 2.0 and 3.0). Microsoft-windows-netfx3-ondemand-package.cab Download
This error often appears in the latest versions of Windows, such as Windows 11 24H2. Microsoft has omitted necessary DesktopDeployment.cab files from newer ISOs, causing the installation to fail with CBS_E_SOURCE_MISSING even when the main CAB file is present.
Air-gapped computers, secure laboratory environments, or industrial control systems cannot connect to Microsoft servers.
dism /online /enable-feature /featurename:NetFx3 /all /source:D:\sources\sxs /limitaccess : Prevents DISM from attempting to contact Windows
Disclaimer: This article provides methods to handle system files. Ensure you have backups before modifying system components via command-line tools. If you'd like, I can:
You do not need to reboot your computer; the framework becomes immediately available to your applications. Troubleshooting Common Installation Failures
Copy your .cab file to a folder, e.g., C:\netfx3 . Once downloaded, right-click the ISO file and select Mount
Click the menu, type cmd , right-click Command Prompt , and select Run as administrator .
Click the , type cmd , right-click on Command Prompt , and select Run as administrator .
Dism /online /enable-feature /featurename:NetFx3 /All /Source:C:\netfx3\microsoft-windows-netfx3-ondemand-package.cab /LimitAccess Use code with caution. Parameter Breakdown: /online : Targets your currently running operating system.
The standard, legitimate way to get the exact version of the package meant for your computer is to extract it directly from official Windows installation media: Step 1: Obtain the Correct Windows ISO