Description of the Update for .NET Framework 4.5.2 for Windows 7 SP1, Server 2008 R2 SP1 and Windows Server 2008 SP2 (KB 4488669)

This update for Windows 7 Service Pack 1 (SP1), Server 2008 R2 Service Pack 1 (SP1), and Server 2008 Service Pack 2 (SP2) includes cumulative reliability improvements in .NET Framework 4.5.2. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.

Important

• If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

¹ Common Language Runtime (CLR)

For more information about this update as it relates to Windows 7 SP1 and Windows Server 2008 R2 SP1, see the following article in the Microsoft Knowledge Base:

4489486 March 2019 Update for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4489486)

For more information about this update as it relates to Windows Server 2008 SP2, see the following article in the Microsoft Knowledge Base:

4489489 March 2019 Update for .NET Framework 2.0 SP2, 3.0 SP2, 4.5.2, and 4.6 for Windows Server 2008 SP2 (KB 4489489)

Workaround 1
Customers who have not experience this issue but who plan to upgrade to a newer version of .NET Framework can take the following steps:

1. Uninstall this update (4488669) if you have already installed it.
2. Upgrade to .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, or 4.7.2.
3. Apply the corresponding update 4488666 for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, or 4.7.2.
   
   Note Update 4488666 contains the same fixes as this update (4488669).

Workaround 2
Customers who have installed this update prior to May 23, 2019, have not experienced this issue and who don’t currently plan to upgrade to a later version of .NET Framework are still advised to uninstall the previous version of this update (4488669) and install the new version of 4488669(v2). For more information, see the "Resolution" section.

Workaround 3
Customers who have experienced this issue after they upgraded to a later version of .NET Framework can take the following steps:

1. Uninstall the later version of .NET Framework (4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, or 4.7.2).
2. Reinstall the desired version of .NET Framework (4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, or 4.7.2). This returns the system to a good state.
3. Apply the corresponding update 4488666 for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, or 4.7.2.
   
   Note Update 4488666 contains the same fixes as this update (4488669).

Resolution
Customers should uninstall the previous version of the update, and then install the latest version of the update that was published on May 23, 2019, to avoid experiencing the issue that is described in this section. To obtain the latest update, see the next section.

Note This update was re-released on May 23, 2019. Please make sure that you download and install the latest version of this update.

Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog.

Windows Software Update Services (WSUS)

On your WSUS server, follow these steps:

1. Select Start, select Administrative Tools, and then select Microsoft Windows Server Update Services 3.0.
2. Expand ComputerName, and then select Action.
3. Select Import Updates.
4. WSUS opens a browser window in which you may be prompted to install an ActiveX control. You must install the ActiveX control to continue.
5. After the ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4489486 for Windows 7 SP1 and Windows Server 2008 R2 SP1 or type 4489489 for Windows Server 2008 SP2 in the Search box, and then select Search
6. Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Select Add to add them to your basket.
7. After you select all the packages that you require, select View Basket.
8. To import the packages to your WSUS server, select Import.
9. After the packages are imported, select Close to return to WSUS.

The updates are now available for installation through WSUS.

Prerequisites

To apply this update, you must have .NET Framework 4.5.2 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

Update replacement information

This update does not replace a previously released update.

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Server 2012

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