Hi,
I'm Sumit, here to help with your query on the Microsoft Q&A forums.
Apologies for any inconvenience you are experiencing. I am happy to help you today.
Please do not use the Installation Assistant in the methods below. Use the ISO instead.
Download Windows 11 ISO
https://www.microsoft.com/software-download/Windows11
Download the Korean ISO > Run Setup.exe and start upgrade.
All the steps, including MCT and Installation Assistant, are covered here:
https://www.yourwindowsguide.com/2024/07/install-windows-11-24h2-offline.html
I hope that helps, and keep us posted.
The above linked blog's content is written by a Windows MVP, so it is safe. However, watch out for the ads. Additionally, It should automatically translate into the browser language as well.