Net Framework Version 4.5 For Windows 7

[Caterina Haggins]

Eachversion of .NET Framework contains the common language runtime (CLR), the base class libraries, and other managed libraries. This article describes the key features of .NET Framework by version, provides information about the underlying CLR versions and associated development environments, and identifies the versions that are installed by the Windows operating system (OS).

.NET Framework is serviced monthly with security and reliability bug fixes. .NET Framework will continue to be included with Windows, with no plans to remove it. You don't need to migrate your .NET Framework apps, but for new development, use .NET 6 or later.

The CLR is identified by its own version number. The .NET Framework version number is incremented at each release, but the CLR version is not always incremented. For example, .NET Framework 4, 4.5, and later releases include CLR 4, but .NET Framework 2.0, 3.0, and 3.5 include CLR 2.0. (There was no version 3 of the CLR.)

The tables that follow summarize .NET Framework version history and correlate each version with Visual Studio, Windows, and Windows Server. Visual Studio supports multi-targeting, so you're not limited to the version of .NET Framework that's listed.

Starting with Visual Studio 2022, Visual Studio no longer includes .NET Framework components for .NET Framework 4.0 - 4.5.1 because these versions are no longer supported. Visual Studio 2022 and later versions can't build apps that target .NET Framework 4.0 through .NET Framework 4.5.1. To continue building these apps, you can use Visual Studio 2019 or an earlier version.

.NET Framework 4.5 is an in-place update that replaces .NET Framework 4 on your computer, and similarly, .NET Framework 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, and 4.8 are in-place updates to .NET Framework 4.5. In-place update means that they use the same runtime version, but the assembly versions are updated and include new types and members. After you install one of these updates, your .NET Framework 4, .NET Framework 4.5, .NET Framework 4.6, or .NET Framework 4.7 apps should continue to run without requiring recompilation. However, the reverse is not true. We do not recommend running apps that target a later version of .NET Framework on an earlier version. For example, we do not recommend that you run an app the targets .NET Framework 4.6 on .NET Framework 4.5.

In Visual Studio, you can choose .NET Framework 4.5.1 as the target framework for a project to compile it as a .NET Framework 4.5.1 assembly or executable. Only run this assembly or executable on computers that have .NET Framework 4.5.1 or later installed. An executable that targets .NET Framework 4.5.1 will be blocked from running on a computer that only has an earlier version of .NET Framework, such as .NET Framework 4.5, installed. The user will be prompted to install .NET Framework 4.5.1. In addition, .NET Framework 4.5.1 assemblies should not be called from an app that targets an earlier version of .NET Framework, such as .NET Framework 4.5.

.NET Framework 4.5.1 and .NET Framework 4.5 are used here only as examples. The principle described applies to any app that targets a later version of .NET Framework than the one installed on the system on which it's running.

Some changes in .NET Framework may require changes to your app code; see Application Compatibility before you run your existing apps with .NET Framework 4.5 or later versions. For more information about installing the current version, see Install the .NET Framework for developers. For information about support for the .NET Framework, see .NET Framework official support policy on the .NET website.

For information about determining which versions or updates are installed on a computer, see How to: Determine Which .NET Framework Versions Are Installed and How to: Determine Which .NET Framework Updates Are Installed.

As evident from the commands above, 9 will list all the SDKs and 10 will list all the runtimes. 11. will provide the output of both 9 and 10 as well as a whole lot of information pertaining to .NET installation the machine

Your latest .NET version would be in the highest v number folder, so if "v4.0.30319" is available that would hold your latest .NET framework. However, the "v4.0.30319" does not mean that you have the .NET framework version 4.0. The "v4.0.30319" is your Visual C# compiler version, therefore, in order to find the .NET framework version do the following.

For the version of the framework that is installed, it varies depending on which service packs and hotfixes you have installed. Take a look at this MSDN page for more details. It suggests looking in %systemroot%\Microsoft.NET\Framework to get the version.

The installed versions are listed under the NDP subkey. The version number is stored in the Version entry. For the .NET Framework 4 the Version entry is under the Client or Full subkey (under NDP), or under both subkeys.

Note: The last row in the above snapshot which got clipped reads On all other OS versions: 461310. I tried my level best to avoid the information getting clipped while taking the screenshot but the table was way too big.

If you open a command prompt and type the following two commands, all framework versions that are installed on the current machine will be listed (each one is stored in a separate directory within this directory).

Microsoft started development on the .NET Framework in the late 1990s originally under the name of Next Generation Windows Services (NGWS). By late 2001 the first beta versions of .NET Framework 1.0 were released.[1] The first version of .NET Framework was released on 13 February 2002, bringing managed code to Windows NT 4.0, 98, 2000, ME and XP.

Since the first version, Microsoft has released nine more upgrades for .NET Framework, seven of which have been released along with a new version of Visual Studio. Two of these upgrades, .NET Framework 2.0 and 4.0, have upgraded Common Language Runtime (CLR). New versions of .NET Framework replace older versions when the CLR version is the same.

The .NET Framework family also includes two versions for mobile or embedded device use. A reduced version of the framework, the .NET Compact Framework, is available on Windows CE platforms, including Windows Mobile devices such as smartphones. Additionally, the .NET Micro Framework is targeted at severely resource-constrained devices.

.NET Framework 4.8 was announced as the final version of .NET Framework, with future work going into the rewritten and cross-platform .NET Core platform (later, simply .NET), which shipped as .NET 5 in November 2020.[2][3] However, .NET Framework 4.8.1 was released in August 2022.[4]

The first version of the .NET Framework was released on 15 January 2002 for Windows 98, ME, NT 4.0, 2000, and XP. Mainstream support for this version ended on 10 July 2007, and extended support ended on 14 July 2009, with the exception of Windows XP Media Center and Tablet PC editions.[14]

.NET Framework 1.0 is supported on Windows 98, ME, NT 4.0 (with Service Pack 6a), 2000, XP, and Server 2003. Applications utilizing .NET Framework 1.0 will also run on computers with .NET Framework 1.1 installed, which supports additional operating systems.[36]

Version 1.1 is the first minor .NET Framework upgrade. It is available on its own as a redistributable package or in a software development kit, and was published on 3 April 2003. It is also part of the second release of Visual Studio .NET 2003. This is the first version of the .NET Framework to be included as part of the Windows operating system, shipping with Windows Server 2003. Mainstream support for .NET Framework 1.1 ended on 14 October 2008, and extended support ended on 8 October 2013. .NET Framework 1.1 provides full backward compatibility to version 1.0, except in rare instances where an application will not run because it checks the version number of a library.[40]

The .NET Framework 1.1 Service Pack 1 was released on 30 August 2004.[43] It requires Windows NT 4.0 SP6a plus Windows Installer 2.0. It is the last version to support Windows NT 4.0 SP6a, Windows 2000 RTM-SP2 and Windows XP RTM-SP1.

Version 2.0 was released on 27 October 2005. It was also released along with Visual Studio 2005, Microsoft SQL Server 2005, and BizTalk 2006. A software development kit for this version was released on 29 November 2006.[44] Support ended on 12 July 2011. It is the last version to support Windows 98, Windows 2000 SP3, Windows ME and Windows Server 2003 RTM.[45]

.NET Framework 2.0 is supported on Windows 98, ME, 2000 (with Service Pack 3 or higher), XP (with Service Pack 2 or higher), Server 2003, Server 2008 and Server 2008 R2.[6] An unofficial backport for Windows 95 was created in 2024.[18][46] Applications utilizing .NET Framework 2.0 will also run on computers with .NET Framework 3.0 or 3.5 installed, which supports additional operating systems.

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