Microsoft warns users: If Windows 11 KB5012643 causes apps to crash, uninstall it

Microsoft just fixed the Safe Mode issue in Windows 11, but the operating system is apparently experiencing further issues with the latest cumulative update. KB5012643, an optional update that contains a number of fixes, is crashing applications that use certain components of the .NET 3.5 Framework.

If you’ve been using Microsoft’s desktop operating systems for a long time, you may have noticed the .NET Framework. The .NET Framework may appear in Windows Update or during the installation of some applications. Many applications rely on the .NET Framework to function properly because it contains a collection of code that developers can call when creating applications.

In short, you only need the .NET Framework to get some applications to work. Unfortunately, the cumulative update apparently broke the .NET Framework integration in the operating system and some apps are now crashing. This happened to those who installed KB5012643 for Windows 11 version 21H2.

Previously, some users experienced safe mode and installation issues as well as a Blue Screen of Death when installing this specific optional update. As the Feedback Hub post highlights, there are reports online documenting various issues with the latest update to Windows 11, including a bug that crashes some .NET 3.5 Framework apps.

"We are running a SQL application on Windows 11 (client and server on the same system). It runs smoothly on Windows 7 and Windows 10. After installing Windows 11 update KB5012643, the application will no longer start .After uninstalling the update, the app does run again without issues," one of the affected users noted on the Feedback Hub.

Thankfully, this glitch does not affect all .NET 3.5 Framework-based applications. In a new update to a support document originally published on April 25, Microsoft noted that applications that use specific components such as Windows Communication Foundation (WCF) and Windows Workflow (WWF) are affected.

We don’t have a list of affected apps, but if you’ve been struggling to launch apps on Windows 11, now you know why.

Microsoft wants users to uninstall updates

So if you are experiencing app crashes on Windows 11, as described by users in the Feedback Hub and subsequently confirmed by Microsoft, it may be worth uninstalling the update Patch to see if that makes any difference.

In the update's documentation, Microsoft's first workaround recommends manually removing the update. To uninstall updates, follow these steps:

1. Click the Start button and search for Windows Update Settings.
2. Windows Update Settings window, select View update history.
3. Select Uninstall updates.
4. Find KB5012643 in the list.
5. Select the patch and click Uninstall.

Otherwise, the only other solution is to try your luck by re-enabling .NET Framework 3.5 and Windows Communication Foundation on the Windows Feature Settings page. You can also do this by running the following command through the terminal:

dism /online /enable-feature /featurename:netfx3 /alldism /online /enable-feature /featurename:WCF-HTTP-Activationdism /online /enable-feature /featurename:WCF-NonHTTP-Activation

There is always a chance that you may run into undocumented issues with these optional updates, which is why we do not recommend optional cumulative updates or drivers Reason for update.

In addition to these issues, users have also reported other issues, including Start, taskbar, USB, and more.

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