Installationsfehler – 0x800f0991

W. Kleimann 25 Reputation points
2025-08-31T17:24:42.6133333+00:00

2025-08 Kumulatives Update für Windows 11 Version 24H2 für x64-basierte Systeme (KB5064081) (26100.5074) - Installationsfehler – 0x800f0991

Windows for home | Windows 11 | Windows update
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Answer accepted by question author
Jonathan Deives 82,130 Reputation points Independent Advisor
2025-08-31T18:00:53.86+00:00

The update you are having trouble installing is just a Preview update. If you are not experiencing any issues with your system, there is no need to install the Preview update, you can wait until it is released (usually in the second week of the month).

On the Windows Update page settings, you can turn off 'Get the latest updates as soon as they're available', which will prevent Windows Update from offering optional updates.

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