Can't install cumulative updates

[KeSun]

Hello! I would like to know what are the ways to update Windows to the latest build without using Windows Update? I have been unable to install the "Cumulative Updates" for a few months due to error 0x800f0991. I have tried running the image repair commands through CMD but it did not resolve. I have also tried installing the updates through the standalone installer downloaded from the Microsoft Update Catalog.
Any help is appreciated!

 

[ChatGPT]

Hello! If you’re having trouble updating Windows via the standard Windows Update method, there are several alternative approaches and troubleshooting steps you can take to resolve the error and successfully update to the latest build.

Alternative Methods to Update Windows Without Using Windows Update​

1. Use the Media Creation Tool​

The Media Creation Tool allows you to upgrade to the latest version of Windows without relying on Windows Update. Steps:

• Download the https://www.microsoft.com/software-download/windows10 from Microsoft's website.
• Run the tool and select Upgrade this PC now.
• Follow the on-screen instructions to complete the upgrade.

2. Use the Windows 10/11 Update Assistant​

The Update Assistant is another tool provided by Microsoft to help update your system to the latest version. Steps:

• Download the https://www.microsoft.com/software-download/windows10 from Microsoft's website.
• Run the tool and follow the on-screen instructions to update your system.

3. Install Updates via Windows Update Catalog​

Since you have encountered issues with the standalone installer, ensure the correct update version is being used, and try using the command line to install the update. Steps:

• Download the appropriate update package from the http://www.catalog.update.microsoft.com/.
• Right-click the downloaded .msu file and select Install.
• If issues persist, try using the command line:
• Open CMD as Administrator and run:

  cmd wusa /install /kb: /quiet /norestart

4. Perform an In-Place Upgrade Repair​

An in-place upgrade can fix many issues and involves installing Windows over the existing installation without losing your data. Steps:

• Download the ISO file for the latest Windows version from the https://www.microsoft.com/software-download/windows10.
• Mount the ISO file by right-clicking and selecting Mount.
• Run setup.exe from the mounted ISO and follow the on-screen instructions to upgrade and repair Windows.

Additional Troubleshooting Steps​

If the above methods fail, you can try to resolve the underlying issues causing the error 0x800f0991 before attempting an update.

1. Run DISM and SFC Commands​

Ensure Windows image is healthy and repairable:

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

2. Check and Fix Windows Component Store​

Re-register Windows Update components and stop services temporarily:

net stop wuauserv net stop cryptSvc net stop bits net stop msiserver ren C:\Windows\SoftwareDistribution SoftwareDistribution.old ren C:\Windows\System32\catroot2 Catroot2.old net start wuauserv net start cryptSvc net start bits net start msiserver

3. Use System Update Readiness Tool​

For Windows 7 and earlier, use the System Update Readiness Tool to fix Windows update errors:

• https://support.microsoft.com/en-us/help/947821

Summary of Methods​

[table="width: 100%"] | Method | Steps |

Media Creation Tool	Download tool, select Upgrade this PC now, follow instructions.
Windows 10/11 Update Assistant	Download Assistant, run and follow on-screen instructions.
Windows Update Catalog	Download .msu file, install via CMD (wusa /install /kb: /quiet /norestart).
In-Place Upgrade Repair	Download ISO, mount, and run setup.exe from the ISO.
Run DISM/SFC Commands	Run DISM and sfc commands to check and restore health.
Check Windows Component Store	Stop services, rename directories, restart services.
System Update Readiness Tool	Download and run tool for older Windows versions.

[/table] By following these methods, you should be able to either update to the latest build successfully or resolve the issues preventing the updates. If you encounter specific errors during these steps, please provide details for more tailored assistance!