To install .NET Framework 3.5 on Windows 10 (64-bit) without an internet connection, you cannot simply use the standard standalone .exe installer, as it often still triggers a download from Windows Update. Instead, the supported offline method requires using the Windows 10 installation media (ISO or USB). Recommended Offline Installation Method
The most reliable way is using the Deployment Image Servicing and Management (DISM) tool via the command line.
Prepare Media: Mount the Windows 10 ISO or insert your installation USB drive. Note the drive letter (e.g., D:).
Open Command Prompt: Search for cmd in the Start menu, right-click it, and select Run as Administrator.
Run DISM Command: Type the following command, replacing D: with your actual drive letter:Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess
Verify: Once the progress bar reaches 100%, you can confirm it is enabled by checking Turn Windows features on or off in the Control Panel. Alternative: Standalone Full Package
If you can briefly access the internet to download a large file for later offline use, you can download the Full Package (Service Pack 1) from the Official Microsoft Download Center. File Name: dotnetfx35.exe Size: ~231.5 MB
Note: On modern Windows 10 versions, even this package may sometimes request a connection to "download and install this feature" during setup. The DISM method above is more guaranteed for strictly offline environments. Important Considerations Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
To install .NET Framework 3.5 on Windows 10 (64-bit) without an internet connection, you must use the original Windows 10 installation media (ISO or USB). Windows 10 does not provide a standard standalone executable installer for version 3.5 like it does for newer versions. Official Offline Installation Method (DISM)
This is the only supported way to install .NET 3.5 offline starting with Windows 10.
Mount Installation Media: Insert your Windows 10 USB or right-click your Windows 10 ISO and select Mount.
Identify Drive Letter: Open "This PC" and note the letter of the drive containing the Windows files (e.g., D:).
Run Command Prompt: Search for cmd in the Start menu, right-click Command Prompt, and select Run as administrator. To install
Execute DISM Command: Type the following command, replacing D: with your actual drive letter, and press Enter:DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs. Alternative: Official Download Links (Online Requirement)
If you can briefly connect to the internet, you can use these official Microsoft links to get the installer package:
Microsoft .NET Framework 3.5 Service Pack 1: A full package that includes subcomponents.
Microsoft .NET Framework 3.5 (Full Package): The complete standalone deployment package. Third-Party Offline Installers
While not officially supported by Microsoft, community-developed tools can automate the DISM process for you:
.NET 3.5 Feature Installer (GitHub): An open-source batch installer for both 32-bit and 64-bit systems.
.NET Framework 3.5 Offline Installer (SourceForge): A GUI tool that automates the command-line installation from your media.
If you're having trouble accessing the SXS folder or mounting the ISO, tell me:
Do you have the Windows 10 ISO or installation USB available?
Are you seeing a specific error code (like 0x800F0906 or 0x800F081F)? Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
Once upon a time, in the land of Digitalia, there lived a humble user named Alex. Alex had just acquired a sleek, powerful machine running Windows 10 64-bit. It was fast, it was modern, and it was ready for anything—or so Alex thought.
One afternoon, Alex tried to launch a beloved vintage photo editor. Instead of the familiar splash screen, a cold, grey box appeared: "The following feature is required: .NET Framework 3.5 (includes .NET 2.0 and 3.0)." Option A — Install from Windows 10 installation
Alex clicked "Download and install," but the progress bar didn't move. The internet connection in Alex’s corner of Digitalia was fickle, dropping out just when needed most. "I need an offline installer," Alex whispered, "something I can carry on a thumb drive to save this machine and others."
The quest began. Alex didn't want a "web installer" that would just fail again; the goal was the full package. Chapter 1: The Official Scroll
Alex first visited the Microsoft Download Center. Navigating through the archives, Alex found the Microsoft .NET Framework 3.5 Service Pack 1 (Full Package). It was a hefty 231 MB file—the "Offline Installer." Alex downloaded it on a stable connection at the village library and brought it home.
But when Alex ran it, Windows 10 shook its head. "This app might not work correctly," it warned. On Windows 10, the old installers sometimes struggled with the new OS's security. Chapter 2: The Hidden Power of the ISO
Alex remembered an old wizard's trick. If you have the Windows 10 Installation Media (an ISO file or a USB drive), the .NET 3.5 files are already hidden inside!
Alex plugged in the Windows 10 USB drive (assigned to drive D:). Alex opened the Command Prompt as Administrator.
With steady fingers, Alex typed the "Spell of Activation":Dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess
The bars climbed to 100%. The system chimed. The "feature" was enabled without downloading a single byte from the web. Chapter 3: Victory
Alex launched the photo editor. This time, there was no error. The vintage pixels filled the screen, vibrant and sharp. Alex tucked the offline installer and the "Spell of Activation" into a digital vault, ready to help any other traveler stuck in the version-gap of Digitalia.
And the machine lived happily—and compatibly—ever after.
Installing .NET Framework 3.5 on Windows 10 (64-bit) without an active internet connection typically requires using Windows 10 installation media (such as an ISO file or USB drive) or the official Standalone Installer if you can download it beforehand from another machine. Method 1: Using Windows 10 Installation Media (Recommended)
Windows 10 already contains the files needed for .NET 3.5 in its installation media, specifically within the sources\sxs folder. Mount the Windows 10 ISO or insert the installation USB
Mount your Windows 10 ISO or insert your installation USB drive.
Open This PC and note the drive letter assigned to the media (e.g., D: or E:).
Right-click the Start button and select Command Prompt (Admin) or Windows PowerShell (Admin).
Enter the following command, replacing D: with your actual drive letter:DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
Wait for the progress bar to reach 100%. Once completed, you will see a "The operation completed successfully" message. Method 2: Official Standalone Installer
If you have access to another computer with internet, you can download the full offline package and transfer it to your offline machine via USB. How To Install .Net Framework 3.5 Offline On Windows 10
This is a comprehensive guide on downloading and installing the .NET Framework 3.5 on Windows 10 (64-bit) using offline methods.
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess
dism /online /Get-Features | findstr /i NetFx3
Windows 10 offers an online installer. When you enable .NET 3.5 via "Windows Features," Windows Update downloads the required files. This sounds easy, but it fails frequently due to:
The solution is the offline installer – a standalone .cab or .exe file that contains all the necessary components. You can copy it to a USB drive, use it on multiple PCs, or install without an internet connection.
Microsoft does not provide a separate, official dotnetfx35.exe installer specifically labeled “for Windows 10 64-bit.” Instead:
dotnetfx35.exe) will fail on Windows 10 without an internet connection because it attempts to download language packs and updates.Instead of searching for a random “download net framework 3.5 windows 10 64 bit offline installer” every time, create a toolkit USB:
D:\Net35_Sourcesxs folder from a Windows 10 ISO.@echo off
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:%~dp0sxs
echo .NET 3.5 installation complete.
pause
Now you have a portable, permanent offline installer.
You need access to the Windows 10 installation files.
D:, E:).sxs folder.DISM /Get-Features to check if NetFx3 is enabled.