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KB5012643 for Windows 11 breaks .NET Framework 3.5 apps
2 min. read
Updated onOctober 4, 2023
updated onOctober 4, 2023
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Key notes
A week has passed since we were talking about the newSafe Mode bugthat affected users who installedKB5012643for Windows 11.
This nasty issue was not present on the known issues list that Microsoft published on the day of the release, so it caught everyone by surprise.
Well, just when you thought the situation couldn’t get any worse,Microsoft drops another bombfor the users that installed this cumulative update.
Windows 11 Build 22000.652 is causing more problems
The tech company has therefore warned Windows 11 users that they might experience issues launching and using some .NET Framework 3.5 applications. Sounds familiar?
Don’t be alarmed, however, as this known issue only impacts systems running Windows 11, version 21H2, after KB5012643 has been downloaded and installed.
The affected software uses optional components such as Windows Workflow (WWF) and Windows Communication Foundation (WCF).
How can I fix this problem?
The short answer is you can’t. That being said, know that the tech giant took it upon itself to remedy this issue as soon as possible.
In the meantime, Microsoft kindly asked affected users to uninstall KB5012643 while it works around this issue and restore their .NET Framework 3.5 apps’ functionality.
Users that find themselves unable to immediately uninstall this cumulative update can actually mitigate the known issue by re-enabling .NET Framework 3.5 and the Windows Communication Foundation from the Windows Features dialog.
Furthermore, IT Admins can accomplish this using an elevated Command Prompt, which they launch as administrators, by running these commands:
How do I uninstall KB5012643?
Have you managed to successfully uninstall KB5012643? Share your experience with us in the comments section below.
More about the topics:Windows 11 Software & Apps
Alexandru Poloboc
Tech Journalist
With an overpowering desire to always get to the bottom of things and uncover the truth, Alex spent most of his time working as a news reporter, anchor, as well as TV and radio entertainment show host.
A certified gadget freak, he always feels the need to surround himself with next-generation electronics.
When he is not working, he splits his free time between making music, gaming, playing football, basketball and taking his dogs on adventures.
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Alexandru Poloboc
Tech Journalist
With a desire to always get to the bottom of things and uncover the truth, Alex spent most of his time working as a news reporter.
