How to fix KB5022478 fails to install in Windows 10?

Issue: Today I launched my PC just as I usually do in the morning, and there was a new update. I waited a bit and then noticed that KB5022478 is not installing. I tried several times – restarted the computer too, but to no avail. Any tips would be appreciated.

Solved Answer

By default, Windows will automatically obtain and install updates as soon as the operating system is activated. Microsoft commonly publishes them on Patch Tuesday – which is typically the second Tuesday of each month. After distributing KB5022478 to millions of Windows 10 users, reports surfaced that this routine update did not always complete successfully.

Numerous users reported that they encountered a multitude of errors when attempting to download and install the latest updates. Rather than gaining access, all they received was an unhelpful message indicating failure, followed by a Retry button which yielded no results after multiple attempts – rendering the update permanently inaccessible for many.

KB5022478 is a preview build released by Microsoft on January 19, 2023. It is a routine cumulative update for .NET Framework 3.5, 4.8, and 4.8.1, which includes several security, quality, and reliability improvements. The update is available to all users running Windows 10 versions 20H2, 21H2, and 22H2.

When KB5022478 fails to install, the issue is usually resolved automatically in a few moments or hours – these failures can be attributed to weak internet connections or Microsoft server issues at the time. However, some installation failures can be rather persistent, with users not being able to apply the latest security and other improvements.

Users may encounter problems when attempting to update either manually or automatically. The cause of the issue could be due to a variety of factors, such as corrupted caches, inactive services, corrupted system files, or even occasional bugs. To resolve these problems, we provide a comprehensive guide with step-by-step instructions to address a number of these scenarios.

Before proceeding, we suggest using FortectMac Washing Machine X9, a powerful repair tool, to scan for corrupted files and other issues. It can effectively fix common Windows problems, such as Blue Screen of Death (BSOD), update failures, registry errors, etc.

How to fix KB5022478 fails to install in Windows 10?

Fix 1. Start with troubleshooter

  • Type Troubleshoot in Windows search.
  • Select Additional troubleshooters.
  • Find Windows Update from the list.
  • Click it and select Run the troubleshooter.
  • Wait till the update is installed and restart your PC.

Run troubleshooter

Fix 2. Check for corrupted system files

Fix it now! Fix it now!
To repair damaged system, you have to purchase the licensed version of Fortect Mac Washing Machine X9.

Corrupted system files might also cause a Windows update to fail. You can repair them by running commands via elevated Command Prompt:

  • Type cmd in Windows search, then right-click and select Run as administrator.
  • When User Account Control asks you if you want to make changes, click Yes.
  • In the Command Prompt window, paste the following command and press Enter:
    sfc /scannow
  • Once the scan is complete, use the following commands and press Enter after each:
    Dism /Online /Cleanup-Image /CheckHealth
    Dism /Online /Cleanup-Image /ScanHealth
    Dism /Online /Cleanup-Image /RestoreHealth
  • Restart your system.


Fix 3. Install the update manually

  • Open your browser and go to the official Microsoft Update Catalog website.
  • Type the KB5022478 into the search and press Enter or click Search.
  • You will find many different versions on the update – you need to find the one that matches your PC specs and Windows version (as a home user, ignore Windows server versions).
  • Right-click on Start and pick System.
  • Under Device specifications, check the System type section: it should either be 64-bit or 32-bit.
  • Scroll down to Windows specifications and check the Version section.
  • Now pick the correct version for your computer.
  • Go to the Microsoft Update catalog, download the appropriate version, and install it.

Install manually

Fix 4. Repair .NET Framework

Fix it now! Fix it now!
To repair damaged system, you have to purchase the licensed version of Fortect Mac Washing Machine X9.

If the installed .NET Framework is corrupted, the update might not be able to go through. Therefore try repairing it as follows:

  • Download Microsoft .NET Framework Repair Tool from the official Microsoft website
  • Start the launcher and select NetFxRepairTool.exe, pressing Next after.
  • Double-click the file to begin the repair process.
  • When prompted, mark the I have read and accept the license terms and click Next.
  • Windows will diagnose all the issues and repair them automatically for you.
  • Restart your PC if the utility doesn't do it for you.

Repair NET Framework

Fix 5. Reset Windows update components

  • Open Command Prompt as administrator
  • When the User Account Control shows up, click Yes
  • Copy and paste each of the command lines, pressing Enter every time (wait till each of them is executed properly):
    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
  • Restart your system.

Reset Windows update components

6. Disable third-party security software

Fix it now! Fix it now!
To repair damaged system, you have to purchase the licensed version of Fortect Mac Washing Machine X9.
Evaluating Windows update installation problems requires that we adhere to a number of conditions. To guarantee an uninterrupted connection between your device and the Windows servers, it is advisable to uninstall any third-party security software you may be running on the system.
If you're experiencing problems with Windows updates, disable the security app temporarily or uninstall it completely – that could potentially solve your issue. Additionally, check if any other software, like a VPN, is interfering and adjust its settings to see if that makes a difference.

Repair your Errors automatically team is trying to do its best to help users find the best solutions for eliminating their errors. If you don't want to struggle with manual repair techniques, please use the automatic software. All recommended products have been tested and approved by our professionals. Tools that you can use to fix your error are listed bellow:

do it now!
Download Fix
do it now!
Download Fix
Compatible with Microsoft Windows Compatible with OS X
Still having problems?
If you failed to fix your error using FortectMac Washing Machine X9, reach our support team for help. Please, let us know all details that you think we should know about your problem.
Fortect - a patented specialized Windows repair program. It will diagnose your damaged PC. It will scan all System Files, DLLs and Registry Keys that have been damaged by security threats.Mac Washing Machine X9 - a patented specialized Mac OS X repair program. It will diagnose your damaged computer. It will scan all System Files and Registry Keys that have been damaged by security threats.
This patented repair process uses a database of 25 million components that can replace any damaged or missing file on user's computer.
To repair damaged system, you have to purchase the licensed version of Fortect malware removal tool.To repair damaged system, you have to purchase the licensed version of Mac Washing Machine X9 malware removal tool.

Prevent websites, ISP, and other parties from tracking you

To stay completely anonymous and prevent the ISP and the government from spying on you, you should employ Private Internet Access VPN. It will allow you to connect to the internet while being completely anonymous by encrypting all information, prevent trackers, ads, as well as malicious content. Most importantly, you will stop the illegal surveillance activities that NSA and other governmental institutions are performing behind your back.


Recover your lost files quickly

Unforeseen circumstances can happen at any time while using the computer: it can turn off due to a power cut, a Blue Screen of Death (BSoD) can occur, or random Windows updates can the machine when you went away for a few minutes. As a result, your schoolwork, important documents, and other data might be lost. To recover lost files, you can use Data Recovery Pro – it searches through copies of files that are still available on your hard drive and retrieves them quickly.


About the author
Ugnius Kiguolis
Ugnius Kiguolis - The problem solver

Ugnius Kiguolis is the founder and editor-in-chief of UGetFix. He is a professional security specialist and malware analyst who has been working in IT industry for over 20 years.

Contact Ugnius Kiguolis
About the company Esolutions

What you can add more about the problem: "How to fix KB5022478 fails to install in Windows 10?"