Download Server 2012 R2 New — Microsoftwindowsnetfx3ondemandpackagecab //top\\

DISM /online /enable-feature /featurename:NetFx3 /All /Source:E:\sources\sxs /LimitAccess

You should see: State : Enabled

DISM /Online /Add-Package /PackagePath:C:\Temp\microsoft-windows-netfx3-ondemand-package.cab

/LimitAccess : Prevents DISM from trying to contact Windows Update. This file (often referred to as the "Features

Before diving into the download process, it is crucial to understand why the .cab file is superior to other installation methods.

The most reliable, modern solution is the . This file (often referred to as the "Features on Demand" package) allows system administrators to install .NET 3.5 without needing the original Windows Server 2012 R2 ISO mounted locally, without Windows Update, and without an active internet connection on the server itself.

Check the box labeled .

This command instructs DISM to install the specific feature from the package file.

Users often search for a "new" download of this file because they encounter error codes (commonly 0x800f081f or 0x800f0906 ) when trying to install .NET 3.5 via the Server Manager GUI. The error messages often state that "The source files could not be found," leading users to believe they need to download the .cab file manually.

Here’s a technical write-up covering the download, deployment, and use of the microsoft-windows-netfx3-onDemand-package.cab for Windows Server 2012 R2 in a modern (air-gapped or offline) scenario. Users often search for a "new" download of

Because Windows Server 2012 R2 optimizes its storage footprint, it utilizes an On-Demand installation model. If your server lacks a direct, unrestricted connection to public servers—or if it relies on a local Windows Server Update Services (WSUS) server that does not host Features on Demand payloads—the OS cannot find the file. Manually pointing your installation wizard or deployment script to this explicit .cab archive solves the lookup mismatch. Where to Securely Download the File

Install from local SxS folder: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs

: The installation failed because secure communication or a required system update is blocking it, or ASP.NET IIS dependencies are conflicting. without Windows Update

If using /quiet , the command prompt will return without output. To verify success: