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The Windows 11 update error 0x800f081f when trying to install KB5055627 typically means that Windows is missing required system files or update dependencies. This error is part of the broader “CBS_E_SOURCE_MISSING” family of Windows errors, which indicates that the system can’t find the files it needs to complete the installation.

Main Causes of Error 0x800f081f When Installing KB5055627
🔹 1. Missing .NET Framework Components
This update may rely on components from .NET Framework 3.5, which is not always enabled by default in Windows 11.

Fix:
Enable .NET Framework 3.5:


🔹 2. Corrupted or Missing Windows Update Files
If the update's required components or previous cumulative update data are missing or damaged, the system can't continue.

🛠 Fix:
Run the following to repair system files:


sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

Then retry the installation.

🔹 3. Conflict with Previous Updates or Incomplete Rollbacks
If another update failed or didn’t uninstall correctly, it may block KB5055627 from completing.

🛠 Fix:

Open Settings - Windows Update - Update History.

Uninstall any recent failed or conflicting updates.

Reboot and try installing KB5055627 again.

Link For Windows 11: https://www.microsoft.com/en-us/software-download/windows11


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》 CHAPTERS 《

00:00 Intro
00:32 Solution 1
01:22 Solution 2
02:31 Solution 3
03:57 Solution 4
07:30 Solution 5
09:03 Outro

🔹 4. Windows Update Components Are Broken
The SoftwareDistribution or Catroot2 folders (used by Windows Update) may be corrupted.