Do you know what Modern Setup Host is and the methods to deal with the problems with it?
If the answers are both no, then this article is what you need.
you could get these methods fromMiniTool.

What Is Modern Setup Host?
What is Modern Setup Host Windows 10?
It is a self-extracting archive and installer, which locates atC:$Windows.BTSourcesfolder.

When Windows is detecting or installing updates, Modern Setup Host will be running in the background.
Luckily, there are some efficient methods for you to solve the problems.
Here is the tutorial:
Step 1: Press theWinkey andIkey at the same time to openSettings.

Step 2: ClickUpdate & Securityand then selectTroubleshoot.
Step 3: Under theGet up and runningsection, clickWindows Updateto chooseRun the troubleshooter.
After finishing these steps, find out if the problems still exist.
Therefore, you might run DISM tool to solve the problems.
Step 2: bang out the following commands one by one, remember to pressEnterafter typing each command.
Its vital, thus never disrupt it.
Then after the process is completed, see whether Modern Setup Host issues are solved.
Therefore, you should check your default system UI language.
The detailed instructions are shown below.
Check the default system UI language:Open Command Prompt as an administrator, typedism /online /get-intland then pressEnter.
However, unnecessary files in this folder will make Modern Setup Host errors appear.
you might follow the steps below to fix the errors.
Step 1: Press theWinkey andRkey at the same time to open theRunbox.
Step 2: EnterC:\Windows\SoftwareDistribution\Downloadand then clickOK.
Step 4: When asked to offer administrator privileges, checkDo this for all current itemsand then clickContinue.
After deleting all the items in the SoftwareDistribution folder, check whether Modern Setup Host errors still persist.
In addition, you could find the solutions to solve the problems with it.