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How to Install Microsoft .NET Framework 3.5

Some older Windows applications still require Microsoft .NET Framework 3.5. Use the section below that matches your Windows version.

If Windows is managed by your organization, you may need administrator permission or an enabled Windows Update service before the installation can finish.


Windows XP

Download Microsoft .NET Framework 3.5 Service Pack 1

For Windows XP, download Microsoft .NET Framework 3.5 Service Pack 1 from Microsoft and install it manually. Restart the computer after installation if Windows asks you to do so.

Windows XP installation video

Before You Start

  • Use an administrator account.
  • Close other installers before running the Microsoft package.
  • Restart Windows after the setup completes if prompted.

Windows 7, Windows 8, and Windows 10

On newer Windows versions, .NET Framework 3.5 is usually added through Windows Features. Windows may download required files from Windows Update during the process.

Windows 7 installation video

Windows 10 installation video

Windows Features Steps

Press Windows Key + S and search for Windows features.

Search for Windows features

Open Turn Windows features on or off.

Open Turn Windows features on or off

In the Windows Features window, find .NET Framework 3.5.

Find .NET Framework 3.5 in Windows Features

Select .NET Framework 3.5, including .NET 2.0 and 3.0.

Select .NET Framework 3.5

Allow Windows Update to download the required files.

Download required files from Windows Update

Wait for Windows to apply the changes.

Wait for Windows to apply changes

When installation is complete, reopen the application that required .NET Framework 3.5.

Microsoft .NET Framework 3.5 installation completed


Troubleshooting Notes

  • If installation fails, confirm that Windows Update is available.
  • If your device is joined to a company network, ask the administrator whether optional Windows components are blocked.
  • Restart Windows after the installation if the application still cannot detect .NET Framework 3.5.

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