Some existing bugs and glitches are fixed in this version update.
Some users have tried this update but some of them report KB5034215 fails to install.
If that still fails, try the following solutions.

To run this utility, kindly do as follows.
Step 1: OpenSettingsby pressingWin + Iand clickUpdate & Security.
Step 2: In theTroubleshoottab, clickAdditional troubleshootersand click onWindows Update > spin up the troubleshooter.
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What if Windows Update Troubleshooter doesnt work as intended?
In this article, you will find multiple solutions to this annoying issue.
Fix 2: Restart Relevant Services
Windows update requires some related services to run well.

If some glitches in the service, the KB5034215 failed to install.
test whether those services have been enabled and restart them.
Step 1: TypeservicesinSearchand initiate the result underBest match.

Then clickApply > OKto save the changes.
After that, just repeat the steps to checkWindows UpdateandCryptographic Servicesseparately for their startup types and status.
Step 1: TypeCommand PromptinSearchand chooseRun as administrator.
Step 2: In theCommand Promptwindow, copy and paste the command and pressEnterto execute it.
like spin up the following commands one by one.
you could temporarily disable your third-party antivirus and peek if the KB5034215 not downloading issue gets resolved.
If you dont have installed any others, you could follow the steps to temporarily disableWindows Defender.
Step 1: OpenSecurity > Update & Security > Windows Security > Virus & threat protection.
Step 2: ClickManage settingsunderVirus & threat protection settingsand turn offReal-time protection.
Now, it’s possible for you to try the Windows update again.
After the move, remember to re-fire up the real-time protection.
Step 1: OpenFile Explorerand right-punch the drive you want to clean to chooseProperties.
Step 2: In theGeneraltab, clickDisk Cleanupand then chooseClean up system files.
Step 3: Check the files to delete and clickOK.
Here Is the Answer.
Hope it is useful for you.