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How to Install .NET 3.5

Written by: on 26 May 2014 02:01 PM 26 May 2014 02:01 PM

Windows 2012 R2

To install .NET 3.5 you need to do the following

1. Mount the Windows 2012 R2 DVD, see:

2. Open a powershell window and type: Install-WindowsFeature -name Net-Framework-Core -source D:\sources\sxs\

Note: the above line assumes that the install DVD is mounted at D:


Windows 2008 R2

How to verify if .NET Framework 3.5 SP1 is installed:

Here are the steps to verify that .NET Framework 3.5.1 is installed on Windows Server 2008 R2.

  1. Click the Start button in the lower left hand corner of the display.
  2. Highlight Administrative Tools and select Server Manager.
  3. In the Server Manager interface, click Features to display all the installed Features in the right hand pane. Verify that .NET Framework 3.5.1 is listed.

If .NET Framework 3.5.1 feature is not listed, you can use either of the following methods to install it:

Method 1: Using Server Manager Interface

  1. In the Server Manager interface, select Add Features to displays a list of possible features.
  2. In the Select Features interface, expand .NET Framework 3.5.1 Features.
  3. Once you expand .NET Framework 3.5.1 Features, you will see two check boxes. One for .NET Framework 3.5.1 and other for WCF Activation. Check the box next to .NET Framework 3.5.1 and click Next.
    Note: If you do not expand .NET Framework 3.5.1 Features and check it, you will get a pop-up titled Add Features Wizard as shown below.
    Click Cancel and expand .NET Framework 3.5.1 Features and then check .NET Framework 3.5.1 check box below it.
    You cannot install .NET Framework 3.5.1 Features unless the required role services and features are also installed.
  4. In the Confirm Installation Selections interface, review the selections and then click Install.
  5. Allow the installation process to complete and then click Close.

Method 2: Using PowerShell

  1. Click the Start button in the lower left hand corner of the display.
  2. Highlight All Programs and select Accessories
  3. Expand Windows PowerShell and right click Windows PowerShell and select Run as administrator. Click Yes on the User Account Control box.
  4. At the PowerShell command prompt, type the following commands, and then press ENTER after each command:
    • Import-Module ServerManager
    • Add-WindowsFeature as-net-framework
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