Normally, the Windows update patches can fix some bugs and offers better user experience.
It is highly advised to keep your Windows up to date.
So, how to fix the KB5023706 not installing issue?

The next part will be helpful.
Microsoft provides two built-in tools to check for and repair the corruption.
Here is the way to run them.
Step 1: PressWin + Xand chooseTerminal (Admin)from the pop-up menu.
Step 2: When the window opens, pressCtrl + Shift + 2to bring up theelevated Command Prompt page.
After that, you’ve got the option to power cycle your setup to try the update again.
Therefore, you could disable your antivirus or Proxy temporarily if you have installed them.
Step 1: OpenSettingsby pressingWin + Iand clickPrivacy & security > Windows Security > Virus & threat protection.
Step 2: ClickManage settingsunderVirus & threat protection settingsand turn off theReal-time protectionoption.
you could verify if the Windows Update andBackground Intelligent Transfer Service(BITS) services have been set correctly.
Step 1: TypeServicesinSearchand open it.
Step 2: Scroll down to locate and double-tap on theBackground Intelligent Transfer Serviceand set itsStartup typetoAutomatic.
Step 3: Then clickStartif the service is not running.
After that, clickApply > OK.
Then just repeat the above steps to check that theWindows Updateservice is running.
you’re free to follow the next steps to fix it up.
Step 1: OpenSettings > Systemand clickTroubleshoot > Other troubleshooters.
Step 2: LocateWindows Updatefrom the list of troubleshooter tools and clickRunnext to it.
You may go to theMicrosoft Update Catalog websiteand search for KB5023706 to download and load the right version.
Besides, you canperform an in-place upgradeto finish the Windows 11 KB5023706 update.
Those two methods both requires you to prepare todata backupin advance because they may cause data loss.
Various features are available for you to perform a scheduled backup with different backup schemes.
Try this program and it’s possible for you to enjoy a 30-day free trial version.
Hope this article is useful for you.