What's new in Windows 10, version 21H2 and how to get it
Once you complete the steps, the Windows 10 21H2 files will download on the computer, and the update process will begin preserving your files, apps, and settings. Typically, the Update Assistant process should take less than an hour to complete.
There are many available ways to upgrade to Windows 10 21H2. For example, you can download Windows 10 21H2 ISO file and install this new Windows 10 new version from USB/DVD. MiniTool Software will show you a full guide in this post.