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Installing the .NET Framework 4.5, 4.5.1, and 4.5.2

This article provides links for installing the .NET Framework 4.5 and its point releases (4.5.1 and 4.5.2) on your computer. If you're a developer, you can also use these links to download and redistribute the .NET Framework with your apps.

Note that installing a new version of the .NET Framework doesn't always replace a previous version. For more information about versions of the .NET Framework and how to determine which versions are installed on a computer, see .NET Framework Versions and Dependencies or How to: Determine Which .NET Framework Versions Are Installed. Use the following table for quick links, or read further for details.

.NET Framework version

Included in

You can also install on

Quick links

4.5.2

--

Use the developer pack to install on:

Windows 8.1 and earlier
Visual Studio 2013
Visual Studio 2012

Download page for 4.5.2 web installer

Download page for 4.5.2 offline installer

4.5.1

Windows 8.1
Windows Server 2012 R2
Visual Studio 2013
(to use Visual Studio 2012 or other IDEs, install the developer pack)

Windows 8 and earlier
Windows Server 2012 and earlier
(for a full list, see system requirements)

Download page for 4.5.1 web installer

Download page for 4.5.1 offline installer

4.5

Windows 8
Windows Server 2012
Visual Studio 2012

Windows 7 and earlier
Windows Server 2008 SP2 and earlier
(for a full list, see system requirements)

Download page for 4.5 web installer

For a general introduction to the .NET Framework for both users and developers, see Getting Started. For information about deploying the .NET Framework with your app, see the deployment guide. To read about the architecture and key features of the .NET Framework, see the overview.

Install a developer targeting pack to develop against the most recent version of the .NET Framework in Visual Studio or another development environment, or download the .NET Framework redistributable for distribution with your app or control.

The developer pack provides the .NET Framework 4.5.1 or 4.5.2 reference assemblies and language packs for use in an integrated development environment such as Visual Studio. Choose one of these developer packs:

From the developer pack download page, choose Download. Next choose Run or Save, and follow the instructions when prompted.

These installers download the .NET Framework components for an app or control that targets those versions of the .NET Framework. These components must be installed on each computer where the app or control runs. Both installers are redistributable, so you can include them in the setup program for your app.

The download page is provided in several languages, but most of the downloads are provided in English only. For additional language support, you must install a language pack.

Two types of redistributable installations are available:

  • Web installer (web bootstrapper) downloads the required components and the language pack that matches the operating system of the installation computer from the web. This package is much smaller than the offline installer but requires a consistent Internet connection. You can download the stand-alone language packs to install additional language support.

  • Offline installer (stand-alone redistributable) contains all the required components for installing the .NET Framework but doesn't contain language packs. This download is larger than the web installer. The offline installer doesn't require an Internet connection. After you run the offline installer, you can download the stand-alone language packs to install language support. Use the offline installer if you can't rely on having a consistent Internet connection.

Both web and offline installers are designed for x86-based and x64-based computers (see system requirements), but do not support Itanium-based computers.

To install or download the .NET Framework from the Microsoft Download Center, follow these instructions. You can also use the links in the table to download the .exe files directly.

  1. Open the download page for the .NET Framework version you want to install:

  2. Select the language for the download page. This option does not download the localized resources of the .NET Framework; it only affects the text displayed on the download page.

  3. Choose Download.

  4. If prompted, select the download that matches your system architecture, and then choose Next.

    You can also use the links in this table to download the .exe files directly:

  5. When the download prompt appears:

    • If you want to install the .NET Framework on your computer, choose Run, and then follow the prompts on your screen.
      —or—

    • If you want to download the .NET Framework for redistribution, choose Save, and then follow the prompts on your screen.

  6. If you want to download resources for additional languages, follow the instructions in the next section to install one or more language packs.

If you encounter any problems during the installation, see Troubleshooting Blocked .NET Framework Installations and Uninstallations.

Installation notes:

  • The .NET Framework 4.5.1 and 4.5.2 are in-place updates to the .NET Framework 4.5.

  • The .NET Framework 4.5 and its point releases replace the .NET Framework 4. When you install these versions on a system that has the .NET Framework 4 installed, the assemblies are replaced.

  • Uninstalling the .NET Framework 4.5 also removes pre-existing .NET Framework 4 files. If you want to go back to the .NET Framework 4, you must reinstall it and any updates to it. (See Installing the .NET Framework 4.)

  • You must have administrative credentials to install the .NET Framework 4.5 and its point releases.

  • The .NET Framework 4.5 redistributable was updated on October 9, 2012 to correct an issue related to an improper timestamp on a digital certificate, which caused the digital signature on files produced and signed by Microsoft to expire prematurely. If you previously installed the .NET Framework 4.5 redistributable package dated August 16, 2012, we recommend that you update your copy with the latest redistributable from the Microsoft Download Center. For more information about this issue, see Microsoft Security Advisory 2749655 and Knowledge Base article 2770445.

Language packs are executable files that contain the localized resources (such as translated error messages and UI text) for supported languages. If you don't install a language pack, .NET Framework error messages and other text are displayed in English. Note that the web installer automatically installs the language pack that matches your operating system, but you can download additional language packs to your computer. The offline installers don’t include any language packs.

Important note Important

The language packs don't contain the .NET Framework components that are required to run an app, so you must run the web or offline installer before you install a language pack.

  1. Open the language pack download page for the .NET Framework version you've installed:

  2. In the language list, choose the language you want to download, and wait a few seconds for the page to reload in that language.

  3. Choose Download.

The following table lists the supported languages.

Language

Culture

Arabic

ar

Czech

cs

Danish

da

Dutch

nl

Finnish

fi

French

fr

German

de

Greek

el

Hebrew

he

Hungarian

hu

Italian

it

Japanese

ja

Korean

ko

Norwegian

no

Polish

pl

Portuguese (Brazil)

pt-BR

Portuguese (Portugal)

pt-PT

Russian

ru

Simplified Chinese

zh-CHS

Spanish

es

Swedish

sv

Traditional Chinese

zh-CHT

Turkish

tr

US English

en-US

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