Windows kb5054979 update information Update content list

Windows 11 KB5054979 is now available for the 24H2 version, bringing new improvements and bug fixes.

About Windows 11 24H2 KB5054979

Microsoft released the KB5054979 cumulative update on March 27, 2025, which is a security update for NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2.

In this update, Microsoft enhanced the security and overall reliability for .NET Framework 3.5 and 4.8.1 and resolved an issue related to the use of System.IO APIs for file and directory operations on UNC shares. It is advisable to implement this update as part of users’ standard maintenance practices.

Windows 11 KB5054979 Download and Install

Are you planning to apply this update to Windows 11 24H2? Below, you will find two methods to obtain the security release.

Option 1. Update Windows via Windows Settings

Step 1. Press Win   I to launch Windows Settings.

Step 2. Go to Windows Update and click Check for Updates. You can find an update called 2025-03 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for x64 (KB5054979),and then click Download & install to get this update.

Option 2. Update Windows via the Download Link

Step 1. Go to the Microsoft Update Catalog and search for the KB5053656 update.

Step 2. Choose the proper version in accordance with your computer and click Download to get the package.

Step 3. In the prompt window, click on the link to download the .msu file. After downloading, double-click on the file to start the installation.

Try These Fixes If KB5054979 Won’t Install

If you are facing the KB5054979 not installing issue, you can try the following solutions. Don’t worry, it’s a common problem that may happen every time when trying to install a new update.

Way 1. Utilize the Windows Update Troubleshooter

Windows includes several troubleshooters to address various problems like hardware, network, and update issues. To begin with, we can run the Windows Update troubleshooter to resolve the issue.

Step 1. Press Win   I to access Windows Settings.

Step 2. Navigate to System > Troubleshoot > Other troubleshooters > Windows Update.

Step 3. Click the Run the troubleshooter button to use this tool. Allow the computer to automatically identify and resolve any detected problems.

Way 2. Perform SFC & DISM Scans

Corrupted system files can disrupt the Windows update process and cause update failures. Executing the SFC and DISM command lines can rectify those erroneous files.

Step 1. Run Command Prompt as an administrator on your computer.

Step 2. Type sfc /scannow and hit Enter to run this command.

Step 3. Once the process finishes, type the following command lines and press Enter after each one.

DISM /Online /Cleanup-Image /Checkhealth

DISM /Online /Cleanup-Image /Scanhealth

DISM /Online /Cleanup-Image /Restorehealth

Way 3. Restore Windows Update Components

Windows Update components are crucial for the download and installation of updates. If you’re facing the issue of KB5054979 not installing, think about resetting the Windows Update components following this comprehensive guide.

Summarize

KB5054979 is a cumulative security update released on March 27, 2025, for Windows 11 version 24H2. It targets .NET Framework versions 3.5 and 4.8.1, enhancing security and overall stability. Notably, the update addresses an issue with file and directory operations on UNC shares using System.IO APIs. Two installation methods are provided: one through Windows Settings by checking for updates under Windows Update, and the other via a manual download from the Microsoft Update Catalog.

In addition, if users encounter installation issues, several troubleshooting steps are recommended. These include running the Windows Update Troubleshooter, using SFC (System File Checker) and DISM (Deployment Image Servicing and Management) scans to repair corrupted system files, and resetting Windows Update components. This update is advised as part of regular maintenance to ensure system reliability and security.

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