How to Fix Update KB5021255/ KB5021234 Not Installing on Windows 11

Being part of the regular update process, Microsoft recently released Update KB5021255/ KB5021234 on Windows 11 22H2, and 21H2 versions respectively. These updates addresses several fixes and improvements to overcome the flaws of the last update. But few users complained that they are not able to install Update KB5021255 on Windows 11 22H2 and Update KB5021234 on Windows 11 21H2 system. 

If you are also struggling to install Update KB5021255/ KB5021234 on your Windows 11, then don’t worry; you are not alone. However, in this article, we have tried to list some solutions that you can try to install the problematic update on your system without any trouble. Then let’s have a look to fix KB5021255/ KB5021234 Not Installing on Windows 11. 

Fix 1: Run Update Troubleshooter

Before moving to any attempt to install Update KB5021255/ KB5021234 on your Windows 11, you should try to run Windows built-in troubleshooter feature. To do so, 

•  Open the Start menu->Settings->Troubleshooter-> Other troubleshooter-> click on the Run button beside Windows Update option.
• Finally, restart the system and install the latest update on your Windows PC. 

Fix 2: Use Windows 11 Installation Assistant

In most cases, installing the Windows 11 Installation Assistant will help you download and install Update KB5021255/ KB5021234 on your Windows 11 smoothly. To do so,  

• Open Windows 11 Installation Assistant-> find Windows 11 Installation Assistant section and click on the Download now button.
• Once done, open the Installation Assistant page and install the pending updates. 

Fix 3: Use Windows 11 Media Creation 

Sometimes downloading the Windows 11 Media Creation tool will help you to install Update KB5021255/ KB5021234 Windows. To do so, 

• Open Windows 11 Media Creation-> find Windows 11 Media Creation section and click on Download now button.
• Once done, you can open the file and install the problematic update on your system.

Fix 4: Reset Windows Update Service

Another solution is resetting the Windows Update service. To do so,  2021-06-06-12_03_39-Services.jpg” alt=”Services” />

• Open Services window-> right-click on Windows Update->Properties-> set Start type to Automatic, then set Services status as Running. 
• Finally, restart the system and reinstall the pending update.

Fix 5: Reset Windows Update Component 

If the above solution does not help you, then you need to reset Windows Update Component. To do so, 

• Open Command Prompt window and type the following commands one by one, and press Enter,

SC config trustedinstaller start=auto
net stop bits
net stop wuauserv
net stop msiserver
net stop cryptsvc
net stop appidsvc
Ren %Systemroot%\SoftwareDistribution SoftwareDistribution.old
Ren %Systemroot%\System32\catroot2 catroot2.old
regsvr32.exe /s atl.dll
regsvr32.exe /s urlmon.dl
regsvr32.exe /s mshtml.dll
netsh winsock reset
netsh winsock reset proxy
rundll32.exe pnpclean.dll,RunDLL_PnpClean /DRIVERS /MAXCLEAN
dism /Online /Cleanup-image /ScanHealth
dism /Online /Cleanup-image /CheckHealth
dism /Online /Cleanup-image /RestoreHealth
dism /Online /Cleanup-image /StartComponentCleanup
Sfc /ScanNow
net start bits
net start wuauserv
net start msiserver
net start cryptsvc

• Once done, you can restart the system and reinstall the pending updates.

Fix 6: Use Microsoft Update Catalog

You can also manually install the update on your Windows with the help of the Microsoft Update Catalog. To do so,

• Open Microsoft Update Catalog-> type; KB5021255/ KB5021234 (based on your PC version) in the search box.
• Now download the suitable file, install it on your system and you are done. 

We hope the information mentioned in this article has helped you to install KB5021255/ KB5021234 on your Windows 11. If you have any concerns related to the information given above, then you can list your doubts in the command box below.