However, some users reported that KB5034123 failed to install.
Here this post onMiniToolfocuses on this topic and provides you with the most effective solutions.
This update made some improvements and fixes to known issues, such as Wi-Fi and security fixes.
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However, some users are having trouble updating to Windows 11 KB5034123, causing KB5034123 to fail to install.
This article is dedicated to helping you address this problem.
Windows 11 KB5034218 was released to the Beta Channel for Windows Insiders.

This article introduces the new changes and fixes.
How to Fix if KB5034123 Not Installing
Fix 1.
This is a way of updating Windows manually by searching for a specific package.

First, go to theWindows update catalog official site.
Second, typeKB5034123in the search box and pressEnter.
Third, click theDownloadbutton next to the needed update.

Finally, in the pop-up window, follow the on-screen instructions to complete the necessary actions.
Press theWindows + Ikey combination to bring up the Windows configs window.
In theSystemsection, scroll down to clickTroubleshoot.
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Next, select theOther troubleshootersoption.
In the new window, click theRunbutton next toWindows Update.
Also, it’s crucial that you take necessary actions during the process if necessary.

Microsoft released the latest Windows 11 insider preview build 23619.
This post shows you whats new in this build in detail.
Fix 3.

Here you might see how to perform a DISM and SFC scan.
Step 1.Open an elevated command prompt.
In the command line window, typeDISM.exe /Online /Cleanup-image /Restorehealthand pressEnter.
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Once the command lines are executed, try updating to KB5034123 and test whether the installation is successful.
Fix 4.
Here we show youhow to disable Windows Defender.
Press theWindows + Ikey combination to open options.
ClickPrivacy & security>Windows Security>Open Windows Security.
In the new window, clickVirus & threat protection, then clickManage settingsunderVirus & threat protection prefs.
Turn off the real-time protection and other protection temporarily.
Then peek if KB5034123 can be installed.
Hope the methods mentioned above are beneficial to you.