Download .net Framework 3.5 Offline Installer For Windows 10 11 [new]

To install .NET Framework 3.5 offline on Windows 10 or 11, you must use your original installation media (ISO or USB) rather than a simple standalone executable, as the offline installer for older versions often requires pre-existing components. Microsoft Learn Method 1: Using Windows Installation Media (Recommended)

This is the most reliable way to install the framework without an active internet connection. Microsoft Learn Mount your Windows ISO : Right-click your Windows 10/11 ISO file and select . Note the assigned drive letter (e.g., Open Command Prompt : Press the button, type , right-click it, and choose Run as administrator Run the DISM Command : Enter the following command, replacing with the drive letter of your mounted ISO:

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs : Once the operation completes, you can verify it in the Turn Windows features on or off Microsoft Learn Method 2: Official Microsoft Download Links Install .NET Framework 3.5 on Windows 10 - Microsoft Learn

While Windows 10 and 11 usually handle framework installations through Windows Update, there are critical scenarios—like restricted environments or newer Windows 11 builds—where you need an offline solution. The Standalone Shift in Windows 11

For users on newer versions of Windows 11 (starting with Build 28000), Microsoft has moved .NET Framework 3.5

to a standalone deployment model. It is no longer an optional component pre-baked into the OS features list and must be downloaded as a dedicated installer. Microsoft Dev Blogs Official Standalone Download: You can find the latest version on the official Microsoft Download Center Service Pack 1 (Full Package):

For a truly "offline" installer that contains all necessary files without needing an internet connection during setup, use the Full Package Download Offline Installation via DISM (Windows 10 & 11)

If you are in an environment without internet access, the most reliable method for standard Windows 10 or 11 versions is using the Deployment Image Servicing and Management (DISM) tool and your original Windows installation media. Microsoft Learn Install .NET Framework 3.5 on Windows 11 - Microsoft Learn

To install .NET Framework 3.5 offline on Windows 10 or 11, you generally cannot use a standard standalone installer because the framework is technically a "feature on demand" already built into the OS but disabled.

The most reliable offline method is using the Deployment Image Servicing and Management (DISM) tool along with your original Windows installation media (ISO, DVD, or USB). Method 1: Using Windows Installation Media (Recommended)

This method uses the files already present on your Windows install disc or ISO.

Mount your Windows ISO or insert your installation DVD/USB. Note the drive letter assigned (e.g., D:).

Open the Start menu, type cmd, right-click on Command Prompt, and select Run as Administrator. To install

Enter the following command, replacing D: with your actual drive letter:Dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess

Press Enter. Once the process reaches 100%, .NET Framework 3.5 will be enabled.

Method 2: Standalone Official Download (Requires Initial Internet)

If you are currently online but need an installer to take to a different, offline machine, Microsoft provides a "full package" (Service Pack 1) that acts as a standalone installer. Install .NET Framework 3.5 on Windows 10 - Microsoft Learn

To install .NET Framework 3.5 offline on Windows 10 or 11, you must use the original Windows installation media (ISO or USB). This version cannot be simply downloaded as a single "standalone" installer file from Microsoft's website for these OS versions; instead, it is a built-in feature that requires access to source files usually found on your installation media. Step-by-Step Offline Installation Guide

Prepare Windows Media: Obtain the Windows 10 or 11 ISO file or a bootable USB drive that matches your current OS version. Mount the Media: If using an ISO, right-click it and select Mount. Note the drive letter assigned to it (e.g., D: or E:).

Open Command Prompt: Search for cmd in the Start menu, right-click it, and select Run as administrator.

Run the DISM Command: Type the following command, replacing X: with your actual drive letter:DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:X:\sources\sxs /All: Enables all parent features.

/LimitAccess: Prevents the system from trying to contact Windows Update.

/Source: Points to the specific folder on your media containing the required .cab files.

Verify Success: Once the progress bar reaches 100%, you can verify the installation in Turn Windows features on or off. Key Official Sources Install .NET Framework 3.5 on Windows 10 - Microsoft Learn

You can download the .NET Framework 3.5 offline installer for Windows 10 and Windows 11 using the following methods: Go to the Microsoft website and search for "

Method 1: Using the .NET Framework 3.5 Installer from Microsoft

  1. Go to the Microsoft website and search for ".NET Framework 3.5 offline installer".
  2. Click on the result that says ".NET Framework 3.5 (includes .NET 2.0 and 3.0)".
  3. Click on the "Download" button.
  4. Select the ".NETFramework35setup.exe" file and download it.

Method 2: Using the Windows Features

  1. Open the "Control Panel" on your Windows 10 or Windows 11 machine.
  2. Click on "Programs and Features".
  3. Click on "Turn Windows features on or off".
  4. Scroll down and check the box next to ".NET Framework 3.5 (includes .NET 2.0 and 3.0)".
  5. Click "OK" to save changes.

Offline Installer Files:

You can also download the offline installer files directly from Microsoft:

System Requirements:

Installation Instructions:

  1. Download the .NET Framework 3.5 offline installer.
  2. Run the installer (dotnetfx35setup.exe).
  3. Follow the prompts to complete the installation.

If you're having trouble finding or installing the .NET Framework 3.5, you can also try checking the Microsoft Support website for more information.

Here is the direct, official download link for the .NET Framework 3.5 offline installer that works on both Windows 10 and Windows 11.

Unlike the web installer, this file contains everything needed and does not require an internet connection during installation.

Method 3: The Open Source Solution (DotNetFx35_W10_W11.exe)

Because the official Microsoft process is cumbersome, independent developers have created repackaged versions that aggregate the correct CAB files into a single, double-clickable EXE that works entirely offline.

While I cannot link to third-party hosts directly (always verify checksums), trusted open-source repositories on GitHub maintain a tool simply called "NetFx3 Offline Installer for Windows 10/11."

How to use it safely:

  1. Only download from repositories with active source code (so you can audit it).
  2. Run the .exe as Administrator.
  3. It automatically detects your Windows version (21H2, 22H2, 23H2, 24H2, or Windows 11) and injects the correct 3.5 libraries.
  4. Click "Install" and reboot.

Note: Always scan third-party executables with Windows Defender before running.

Part 1: What is .NET Framework 3.5? (And Why Does Windows 11 Need It?)

The .NET Framework is a software development platform created by Microsoft. It provides the runtime environment necessary for many applications (especially games, ERP software, and legacy business tools) to run.

Version 3.5 (which includes versions 2.0 and 3.0) is critical because:

Important Note: Windows 10 and Windows 11 do not ship with .NET 3.5 enabled by default. Attempting to install it via the standard web installer requires an active internet connection to download 200–300 MB of cab files. The offline installer allows you to skip this requirement.

Step 3: Run the Deployment Image Servicing and Management (DISM) Command

Now, we will install .NET 3.5 directly from that CAB file.

  1. Press Windows + X and select Terminal (Admin) or Command Prompt (Admin).
  2. Type the following command (replace D: with your actual DVD drive letter):
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
  1. Press Enter.

What this command does:

Expected result: You should see a progress bar (0.0% to 100%). The operation will complete in 2–5 minutes. No internet connection required.

Part 7: Frequently Asked Questions (FAQ)

Option 1: The Official Microsoft Offline Installer (ISO)

For users who need to install this on multiple computers or have no internet access, the official offline installer is the best method.

The Misconception: Why No Single “Standalone EXE” Exists Like for Newer Frameworks

First, it is important to clarify a common misconception. Unlike .NET Framework 4.x or newer versions such as .NET 6/7/8, Microsoft does not provide a single, user-friendly executable file named dotnetfx35.exe for offline installation on Windows 10 or 11. The official redistribution package labeled “.NET Framework 3.5” from Microsoft’s download center is actually a bootstrapper that still requires internet access to fetch components from Windows Update. For a true offline installation, you must use one of two reliable methods: the “Features on Demand” source files from an original Windows installation media (ISO), or the deployment tools available to IT professionals.

The Official and Most Reliable Offline Method: Using Windows Installation Media

The definitive way to install .NET Framework 3.5 offline on Windows 10 or 11 involves the operating system’s own DISM (Deployment Imaging Service and Management Tool) command and a copy of the Windows installation ISO that matches your system’s edition, language, and architecture (64-bit). Here is the process in summary:

  1. Obtain a Windows 10 or 11 ISO file — Use Microsoft’s official Media Creation Tool to download the correct version.
  2. Mount the ISO — Right-click the ISO file and select “Mount.” Note the drive letter assigned (e.g., D:).
  3. Open Command Prompt as Administrator — Right-click Start and choose “Terminal (Admin)” or “Command Prompt (Admin).”
  4. Run the DISM command: 
    DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
    (Replace D: with your mounted ISO drive letter.)

This command instructs Windows to enable the .NET Framework 3.5 feature using the source files located in the sources\sxs folder of the installation media, without ever contacting Windows Update. This method is 100% offline after the ISO is obtained and is the recommended approach by Microsoft for enterprise and reliable home installations.

Step 3: Install via DISM

  1. Open Command Prompt as Administrator.
  2. Run the following (adjust the drive letter and path to your ISO): 
    dism /online /enable-feature /featurename:NetFX3 /all /source:D:\sources\sxs /limitaccess
    • /limitaccess is the critical switch—it tells Windows not to search Windows Update, ensuring a true offline install.
  3. Wait for the operation to complete (usually 60–90 seconds).
  4. Close the Command Prompt and unmount the ISO.
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