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Net Framework 3.5 Offline Installer | Windows 10 64 Bit

How to Install .NET Framework 3.5 Offline on Windows 10 (64-bit)

Need .NET Framework 3.5 on a Windows 10 (64-bit) machine without internet access? Follow this quick offline installer guide.

Error 0x800f0950 (DISM failed)

Cause: The source files are corrupted or the wrong architecture (32-bit vs 64-bit). Solution: Ensure your Windows 10 ISO matches your OS version (Home, Pro, Enterprise) and build number (22H2, etc.). Use a fresh ISO from Microsoft. Net Framework 3.5 Offline Installer Windows 10 64 Bit

Method A: Using Windows 10 ISO (Recommended for IT Pros)

  1. Download the Windows 10 Media Creation Tool from Microsoft’s official website.
  2. Run the tool and select "Create installation media for another PC".
  3. Choose your language, edition, and 64-bit architecture.
  4. Select ISO file (not USB flash drive). Save the Windows10.iso (approx. 5 GB).
  5. Right-click the ISO file and select Mount. It will appear as a new DVD drive (e.g., D:).
  6. Open Command Prompt as Administrator.
  7. Run the following DISM command (replacing D: with your drive letter):
Dism /online /enable-feature /featurename:NetFX3 /all /source:D:\sources\sxs /limitaccess

What this does: The /limitaccess flag prevents Windows Update from being used. The /source points directly to the sxs folder on the Windows 10 ISO, which contains the exact 64-bit .cab files for .NET 3.5. How to Install

Error 0x80070005 – Permission denied

Cause: You did not run Command Prompt as Administrator.
Fix: Always right-click CMD or Terminal and select Run as administrator. Download the Windows 10 Media Creation Tool from

Part 10: Alternative - Using a Third-Party Repack (Proceed with Caution)

Some reputable tech forums host repacked offline installers. Tools like "Microsoft .NET Framework 3.5 Offline Installer" by MajorGeeks or TechPowerUp have been verified by communities. However, always check SHA-1 hashes against Microsoft’s official reference. For enterprise environments, stick to the DISM + ISO method.

Q4: How big is the offline installer?

The microsoft-windows-netfx3-ondemand-package.cab is approximately 280 MB. The extracted installation consumes about 400 MB on your system drive.