How to Fix Windows 11 KB5049622 Fails to Install Issue

KB5049622 was released on January 14, 2025, and is a cumulative update for .NET Framework 3.5 and 4.8.1, specifically for Windows 11 version 24H2.

The main purpose of this update is to address a major remote code execution vulnerability, which is identified as CVE-2025-21176.

But recently some people reported that they encountered Windows 11 KB5049622 not installing. How to solve it? Please continue reading below.

Way 1: Run Windows Update Troubleshooter

When you can’t install KB5049622 in Windows 11, you can run the Windows Update Troubleshooter.

Step 1: Press the Windows + S to open the Search window and type Troubleshoot settings to open.

Step 2: In the new pop-up window, click Other troubleshooters from the right side.

Step 3: Find Windows Update and click Run next to the section.

Way 2: Run SFC and DISM

Corrupted system files can also impact the Windows update. To fix these corrupted files, you can run SFC and DISM on your PC. Here’s how to do that:

Step 1:Ttype “command prompt” in the search box.

Step 2: Click Run as administrator under the Command Prompt app.

Step 3: Type sfc /scannow and press the Enter key.

Step 4: Once done, restart your computer to check if the error is fixed. If not, proceed by initiating a DISM scan.

Step 5: Run the Command Prompt as administrator on your PC again. Run the following commands sequentially:

• DISM.exe /Online /Cleanup-image /Scanhealth
• DISM.exe /Online /Cleanup-image /Checkhealth
• DISM.exe /Online /Cleanup-image /Restorehealth

Step 6: Once done, restart your computer to check if KB5049622 fails to install on Windows 11 problem still exits or not.

Way 3: Turn off Third-Party Antivirus

Sometimes third-party antivirus software may identify Windows 11 KB5049622 installation files as viruses or malware and then block them from updating. Therefore, before trying to update KB5049622 on your PC, you can temporarily turn off all third-party antivirus applications.

Way 4: Clear and Reset Windows Update Cache

Some people on the forums have tried clearing and resetting the Windows update cache and it successfully helped them fix the “KB5049622 failed to install” issue. So, you can also try it. Here are the detailed steps:

Step 1: Input the Command Prompt in the Search box and run it as an administrator.

Step 2: In the pop-up window, run the following commands to restart all the services.

• net stop bits
• net stop wuauserv
• net stop appidsvc
• net stop cryptsvc
• Del “%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\*.*”
• rmdir %systemroot%\SoftwareDistribution /S /Q
• rmdir %systemroot%\system32\catroot2 /S /Q
• regsvr32.exe /s atl.dll
• regsvr32.exe /s urlmon.dll
• regsvr32.exe /s mshtml.dll
• netsh winsock reset
• netsh winsock reset proxy
• net start bits
• net start wuauserv
• net start appidsvc
• net start cryptsvc

Once done, check if the Windows 11 KB5049622 not installing issue has been resolved.

Way 5: Perform Windows Clean Boot

If you have tried many methods and still cannot solve the KB5049622 fails to install problem, you can consider whether it is caused by software or program conflicts. To solve the problem, you can try to perform a clean boot on Windows 11.

Way 6: Free up Disk Space

If your disk space is insufficient, it may also be the reason why KB5049622 fails to install. After you try to delete unnecessary files and uninstall useless applications, the disk space is still insufficient, so what should you do?

At this time, you need to expand your partition size. We recommend that you use a third-party tool – MiniTool Partition Wizard. The Extend Partition feature of this tool can help you increase the partition size.

Bottom Line

This concludes the post. It outlines 6 practical solutions to resolve the KB5049622 failed to install issue. If you face the same issue, you can try these methods one by one until it’s resolved.

In addition, MiniTool Partition Wizard is a professional partition manager that can help you to migrate OS to SSD without reinstalling OS, convert MBR to GPT, change cluster size, partition hard drive, rebuild MBR, and more.

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