Introduction
This article describes the Microsoft .NET Framework 4.5.1, which is a highly compatible, in-place update to the Microsoft .NET Framework 4 and the Microsoft .NET Framework 4.5.On the Microsoft Download Center, the .NET Framework 4.5.1 is available for Windows 8, Windows RT and Windows Server 2012. On Windows Update (WU) and on Windows Server Update Service (WSUS), the .NET Framework 4.5.1 is only available for Windows Server 2012.On Windows Update, the .NET Framework 4.5.1 for Windows Server 2012 will be offered as a Recommended update. Notes
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On Windows Update, a Recommended update may be installed automatically on all supported platforms, based on your computer settings.
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On Windows 8, you can also install the Microsoft .NET Framework 4.5.1 by upgrading your computer to Windows 8.1.
More Information
For more information about the .NET Framework 4.5.1 or the .NET Framework Developer Center, visit the following Microsoft website:
The .NET Framework Developer Center For more information about how to block the .NET Framework 4.5.1 from being offered on Windows Update, click the following article number to view the article in the Microsoft Knowledge Base:
2721187 How to temporarily block the installation of the .NET Framework 4.5.1 and its corresponding language packs
Update information
The following files are available for download from the Microsoft Download Center:The .NET Framework 4.5.1 
119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Command-line switches for this update
For information about the various command-line switches that are supported by this update, visit the following Microsoft Knowledge Base:
How to use command-line switches when you install the .NET Framework 4.5.1
Restart requirement
You may have to restart the computer after you install this update. We recommend that you close all applications that are using the .NET Framework before you install this update.
References
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
