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Article ID: 2765375 - Last Review: October 18, 2012 - Revision: 1.0

Summary

Trying to install the .Net Framework 4.0 Full package on Windows 8 or Windows Server 2012 will fail with the following error message - Microsoft .NET Framework 4 is already part of this operating system and Same or higher version of .NET Framework 4 has already been installed on this computer.
Package download location: Microsoft .NET Framework 4 (Standalone Installer) (http://www.microsoft.com/en-in/download/details.aspx?id=17718)

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Microsoft .Net Framework 4 Setup


Similarly, trying to install the .Net Framework 4.5 Full package on Windows 8 or Windows Server 2012 will fail with the following error message.
Package download location: Microsoft .NET Framework 4.5 (http://www.microsoft.com/en-in/download/details.aspx?id=30653)

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Microsoft .Net Framework 4.5 Setup


The .NET Framework 4.5 (includes .Net 4.0) is default

More information

The .NET Framework 3.5 (includes .Net 2.0 SP2, .Net 3.0 SP2 and .Net 3.5 SP1) is optional and is also built into the operating system.

Following these steps to enable to the .Net Framework 3.5 and .Net Framework 4.5 on Windows 8 and Windows Server 2012.

On Windows 8:

1. Press Windows Key + X.
2. Select Programs and Features.
3. Click Turn Windows Features on or off.

OR

1. Press Windows Key + R, to get the Run command.
2. Type “OptionalFeatures.exe” and press enter.

The following dialog box should appear.

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Windows Features


Check all the .Net 3.5 and .Net 4.5 related check boxes and click OK.
The computer need to be restarted after the setup is over.

On Windows Server 2012:

1. Press Windows Key + X.
2. Select Programs and Features.
3. Click Turn Windows Features on or off.

OR

1. Press Windows Key + R, to get the Run command.
2. Type “ServerManager” and press enter.

Follow the steps to all Roles and Features and it would reach the following dialog box.

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Add Roles and Features Wizard


Check all the .Net 3.5 and .Net 4.5 related check boxes and click OK.

For additional information on this topic, please refer to the following web pages.

Installing the .NET Framework 3.5 on Windows 8 (http://msdn.microsoft.com/en-us/library/hh506443.aspx)


.NET Framework 4.5 is default and .NET Framework 3.5 is optional (http://msdn.microsoft.com/en-us/library/windows/desktop/hh848079(v=vs.85).aspx)

Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use (http://go.microsoft.com/fwlink/?LinkId=151500) for other considerations.

Applies to
  • Microsoft .NET Framework 4
  • Microsoft .NET Framework 4.5
  • Microsoft .NET Framework 3.5 Service Pack 1
  • Windows 8
  • Windows Server 2012 Standard
Keywords: 
KB2765375
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