Install error - 0x800f0991 while installing 2025-12 Security Update (KB5072033)(26200.7462). Any solution?

Question

It has failed few times while trying to install 2025-12 Security Update (KB5072033)(26200.7462). It show Install error - 0x800f0991 . Anyone has a solution for this issue? I have already windows repair it is still having the same issue.

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Moved from: Microsoft Security | Microsoft Authenticator

Answer 1

The error code 0x800f0991 typically indicates that the system is unable to find the required files to install the update. Here are some steps you can take to resolve this issue:

1. Check Internet Connection: Ensure that your system is connected to the Internet, as the update may need to download necessary files.
2. Use DISM Tool: Run the Deployment Image Servicing and Management (DISM) tool to repair the Windows image. Open an elevated Command Prompt and run the following command:

      DISM.exe /Online /Cleanup-Image /RestoreHealth
   

3. Run SFC Scan: After running the DISM tool, you can also run the System File Checker (SFC) to check for and repair corrupted system files. Use the following command in an elevated Command Prompt:

      sfc /scannow
   

4. Check for Prerequisite Updates: Ensure that all prerequisite updates are installed. Sometimes, updates depend on previous updates being installed first.
5. Manual Installation: If the update continues to fail, you can try downloading the update manually from the Microsoft Update Catalog and installing it.

If these steps do not resolve the issue, consider reaching out to Microsoft Support for further assistance.