If you search for "download .NET Framework 3.5 offline installer," you will find many third-party websites offering EXE files. Do not use them. These are often bundled with malware or adware.
The truth: Microsoft does not provide a standalone, self-contained EXE for .NET 3.5 for Windows 10/11.
Instead, the "offline" method requires using your original Windows installation media (ISO file or USB drive) or the Windows Feature-on-Demand mechanism.
Several issues arise when attempting to install .NET Framework 3.5 offline:
Because cybercriminals know people search for "offline installer." They wrap malware into fake installers. The official method (ISO + DISM) is the only secure route.
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.
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.
Here’s a short, user-friendly story to guide someone through downloading the .NET Framework 3.5 offline installer for Windows 10 or 11.
Title: Leo and the Offline Installer
Leo was setting up an old manufacturing program on his new Windows 11 laptop. The software needed .NET Framework 3.5, but Leo’s internet at the workshop was spotty at best. He knew the usual online installer would fail.
He remembered the trick: download the offline installer directly from Microsoft’s website. It’s technically part of the Windows operating system, not a standalone download like normal software. So he searched for “Download .NET Framework 3.5 offline installer” and found Microsoft’s official page. If you search for "download
On the page, Microsoft said: “For Windows 10 and 11, use the ‘microsoft-windows-netfx3-ondemand-package’.”
Leo clicked the link, downloading a small .cab file (around 70 MB). That was it. No confusing setup wizard yet.
Now, to install it offline, he opened Command Prompt as Administrator and typed:
dism /online /add-package /packagepath:"C:\path\to\your\downloaded.cab"
After a couple of minutes, the command prompt said: “The operation completed successfully.”
Leo restarted his PC, and the old software ran perfectly—no internet connection required during installation. He saved the .cab file on a USB stick for future use, becoming the hero of his workshop’s IT corner.
Key takeaway: For Windows 10/11, the offline installer is a .cab file from Microsoft, installed via DISM command, not a classic .exe.
Installing .NET Framework 3.5 (which includes .NET 2.0 and 3.0) on Windows 10 and 11 usually requires an internet connection via Windows Update. To perform a truly offline installation, you must use the original Windows installation media.
Method 1: Offline Installation via Installation Media (Recommended)
This is the only officially supported method for completely offline systems. You will need a Windows ISO, DVD, or USB for your specific OS version.
Mount the Windows ISO: Right-click your Windows ISO file and select Mount (or insert your USB/DVD). Note the drive letter assigned (e.g., D:).
Open Command Prompt as Admin: Press the Start button, type cmd, right-click it, and select Run as Administrator.
Run the DISM Command: Type or paste the following command, replacing D: with your actual drive letter:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess Use code with caution. Copied to clipboard
/Source:D:\sources\sxs points to the specific folder on your media containing the required .cab files. Several issues arise when attempting to install
/LimitAccess ensures the installer does not try to connect to Windows Update.
Method 2: Standalone Download (Specific Windows 11 Versions)
For newer builds of Windows 11 (specifically Build 28000/26H1 and later), Microsoft has shifted .NET 3.5 to a standalone installer.
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
To install .NET Framework 3.5 offline on Windows 10 or 11, you generally have two choices: using your Windows installation media (the most reliable method) or downloading a standalone package Method 1: Using Windows Installation Media (Recommended)
This method is ideal if your computer is completely offline because it uses the files already present on your Windows ISO or USB drive. Microsoft Learn Mount the Windows ISO : Right-click your Windows 10 or 11 ISO file and select . Note the drive letter assigned (e.g., Open Command Prompt as Admin : Search for in the Start menu, right-click it, and select Run as administrator Run the DISM Command : Type the following command and press , replacing with your actual drive letter:
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs Use code with caution. Copied to clipboard enables all parent features. /LimitAccess prevents the tool from trying to reach Windows Update.
points to the specific folder on your media containing the installation files. Microsoft Learn Method 2: Standalone Offline Installer You can download the full redistribution package from the Microsoft Download Center on another computer and transfer it via USB. dotnetfx35.exe (Full Package). Installation Simply put, if you work in IT or
: Run the downloaded file on the target computer. Note that even with the "full" package, Windows might sometimes still prompt to download additional updates from Windows Update if the version isn't perfectly matched to your OS build. Method 3: Windows Features (Requires Internet)
If you have a temporary internet connection, the easiest way is to enable it directly through the OS: Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
Feature: Offline Installation of .NET Framework 3.5 on Windows 10/11 using a Single Command
Are you tired of struggling to install .NET Framework 3.5 on your Windows 10 or 11 machine, only to be met with errors or dependencies issues? Look no further! With this feature, you can now install .NET Framework 3.5 offline using a single command, without requiring an active internet connection.
The Problem: Prior to this feature, installing .NET Framework 3.5 on Windows 10/11 required an active internet connection to download the necessary files. This posed a challenge for users with limited or no internet connectivity. Moreover, the installation process could be lengthy and often resulted in errors.
The Solution: To address this issue, you can use the following command in the Command Prompt (or PowerShell) to install .NET Framework 3.5 offline:
dism /online /enable-feature /featurename:NetFx3 /source:<path_to_source>\sxs
Here, <path_to_source> represents the location of the .NET Framework 3.5 source files, which you can download from Microsoft's official website.
Step-by-Step Instructions:
dism /online /enable-feature /featurename:NetFx3 /source:C:\NETFX3.5\sxs
Benefits:
Tips and Variations:
By following these steps and using this single command, you can easily install .NET Framework 3.5 offline on your Windows 10 or 11 machine, without the need for an active internet connection.