Download .net Framework 3.5 Offline Installer For Windows 10 11 May 2026
Microsoft does not provide a simple .exe file for the full offline version of .NET 3.5. Instead, they provide a DVD ISO image.
You can download the official ISO from Microsoft without a product key.
Note: The ISO is roughly 5–6 GB. You are not installing Windows; you are extracting a single folder from it.
Raj needed an older business app to run on his new Windows 11 laptop. The installer kept failing, complaining that .NET Framework 3.5 was missing. He searched the web and found conflicting advice: online installers that stalled, forum threads with broken links, and risky third‑party packages.
Refusing to waste time, Raj chose a safer route: an official offline installer from a trusted source. He downloaded the standalone package to a USB stick from his desktop, brought it to the laptop, and ran the installer as Administrator. The setup unpacked quietly, applied the files, and finished without needing an internet connection. After a quick restart, the legacy app launched perfectly.
Relieved, Raj bookmarked the clean installer and noted a simple checklist for future restores:
He saved time and avoided installing untrusted software — and the legacy app ran like new.
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. Microsoft does not provide a simple
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
Installing .NET Framework 3.5 on Windows 10 or 11 requires a slightly different approach than typical software because it is built into the operating system as an "on-demand" feature. If you are strictly
, you cannot use the standard "Turn Windows features on or off" menu, as that method tries to download files from Windows Update. Microsoft Learn To install it without an internet connection, you must use Windows Installation Media (ISO or USB) as your source. Microsoft Learn Step 1: Prepare the Offline Source Obtain Media
: You need the Windows 10 or 11 installation media that matches your current OS version. Mount the ISO : If you have an ISO file, right-click it and select . Note the assigned drive letter (e.g., Locate SxS : Verify that the folder [Drive Letter]:\sources\sxs exists. This folder contains the files needed for the offline installation. Spiceworks Community Step 2: Install via Command Prompt (DISM) Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
To install .NET Framework 3.5 offline on Windows 10 or 11, the most reliable methods involve using your Windows installation media or a standalone package from Microsoft. Method 1: Using Windows Installation Media (DISM)
This is the standard offline method that uses the source files already present on a Windows ISO or USB. You can download the official ISO from Microsoft
Mount Windows Media: Plug in your Windows USB drive or right-click your Windows ISO file and select Mount. Note the drive letter (e.g., D: or E:).
Open Command Prompt: Press the Start button, type cmd, right-click Command Prompt, and select Run as administrator.
Run the DISM Command: Type the following command, replacing D: with your actual drive letter, and press Enter:DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess.
Completion: Once the progress bar reaches 100%, the framework is installed. Method 2: Standalone Installer (Windows 11 Build 28000+)
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. Note: The ISO is roughly 5–6 GB
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
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.
Before we dive into the download, let’s address the obvious: Why is software from 2007 still relevant?
Simply put, if you work in IT or enjoy retro PC gaming, you need this installer on a USB drive.
