Windows 11 KB5049624 update is specifically for Windows 11 versions 22H2 and 23H2 and is a cumulative update for .NET Framework versions 3.5 and 4.8.1, released on January 14, 2025. The main purpose of this update is to enhance the security and reliability of the .NET Framework on Windows 11 systems.
What’s New in Windows 11 KB5049624
This update focuses on resolving critical vulnerabilities, and its security improvements and reliability enhancements are essential to maintaining the integrity and performance of applications built on the .NET Framework. Users acknowledge the importance of security updates in maintaining the integrity of the system. Here are some new improvements in Windows 11 KB5049624.
- Addresses an important remote code execution vulnerability, identified as CVE-2025-21176, that could allow an attacker to execute arbitrary code on a system running an affected version of the .NET Framework.
- It also addresses a rare issue that could cause an infinite loop when a thread first enters the common language runtime (CLR).
These improvements are critical for developers and users who rely on the .NET Framework to develop applications. After knowing the improvements, the following content will teach you how to install Windows KB5049624.
How to Install Windows KB5049624
Method 1: Install KB5049624 With Windows Update
Windows Update is a service provided by Microsoft for the Microsoft Windows operating system that automatically downloads and installs Microsoft Windows software updates through the Internet. Here is how to use the Windows Update to get the KB5049624.
Step 1: Right-click on the Start button and choose the Settings option to open it.
Step 2: In the Settings, click on Windows Update > Check for updates.

Step 3: If any updates are available for you, click on the Download & install button. Your device will download and install the updates.
If prompted to do so, restart your device to apply the updates.
Method 2: Install KB5049624 via Microsoft Update Catalog
You can also get this update in the Microsoft Update Catalog. This is a service provided by Microsoft that provides a list of updates for Windows. You can use it as a one-stop location for finding Microsoft software updates, drivers, and patches. Work with the following steps.
Step 1: Go to the Microsoft Update Catalog. You will see the KB5049624 updates here.
Step 2: Browse the list that is displayed to select the updates that you want to download.
Step 3: Click on the Download button and hit the link in the pop-up window to download the updates.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
Recover Data Lost due to Windows Fails to Install
Some of you may encounter that Windows update deletes files. Luckily, you can restore the lost data using this free data recovery software, MiniTool Power Data Recovery. This tool supports recovering almost all types of files from different storage devices. It can also retrieve the data lost due to Windows update failure. By the way, you can use it to restore 1 GB of files without any cent. Download and install it on your computer to get started.
MiniTool Power Data Recovery FreeClick to Download100%Clean & Safe
Step 1: Launch this recovery software to enter its main interface.
Step 2: In the Logical Drives tab, find the partition where your lost data were stored. Hover the cursor to the section and click on Scan to scan for data.
Step 3: To get the best scan results, you need to wait for the process to be completed.
Step 4: When the scan ends, use the Type, Filter, and Search feature to find the required files.
Step 5: Once you locate them, tick them all and click on the Save button.
Step 6: In the pop-up window, choose a new location to store the recovered files and click on OK to begin saving.

Step 7: When the recovery finishes, a window will show up with the information of the size of the recovered files and the free remaining recovery capacity.
Final Thoughts
You have a better understanding of the new improvements of the Windows 11 KB5049624 and how to get this update. Remember to back up Windows before you start installing it. And if you lost data, use MiniTool Power Data Recovery to restore them.