Windows 11 21H2 known issues blocking upgrade

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• Microsoft publishes the Windows 11 known issues.
• The initial release includes three compatibility issues blocking the upgrade.
• You shouldn’t try to upgrade if your PC has one of these problems.

On October 5, Microsoft began the slow and controlled rollout of Windows 11 (version 21H2), the next version of the OS that brings an overhauled interface and a lot of new features. Along with the initial release, the company also published a list of the current known issues that may negatively affect some computers.

The complete list of Windows 11 known issues was released on the health dashboard page, and at the time of this writing, it only includes three problems that have been confirmed. As a result of these issues, the affected computers currently have an upgrade hold until the problem has been resolved.

Known issues for Windows 11 21H2

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This is the list of confirmed known issues blocking the installation of version 21H2:

• Compatibility issues with Intel “Killer” and “SmartByte” networking software. This problem may cause the internet to be slower on affected computers.
• Compatibility issues between Oracle VirtualBox and Windows 11. This issue prevents VirtualBox virtual machines from starting if the computer also has Hyper-V installed.
• Compatibility issues Cốc Cốc browser and Windows 11. The browser may not open on Windows 11.

Although there are a few issues, they are only affecting a small group of devices, and at the time of this writing, Microsoft is placing an upgrade hold until there is a fix for these problems. In the meantime, the company recommends not to upgrade manually to prevent a negative experience.

Windows 11 seems that is off to a good start, but it doesn’t mean that more issues will appear. As more computers install version 21H2, the company will update the dashboard page with more information and possible workarounds where applicable.

In addition to these issues, Windows 11 also have another big problem, a memory leak caused by a bug in File Explorer, which Microsoft has not acknowledged as a bug, but it is affecting some devices.