Recently I have been downgraded me acer notebook desktop PC from win 11 to win 10.
Windows 10 Home China
https://www.microsoft.com/zh-cn/software-download/windows10
MediaCreationTool22H2 .exe
下载 windows 10 home （家庭版）
语言：中文简体
创建U盘安装盘
安装win10
下面开始直接安装
启动 win11
选择u盘
然后从中启动setup .exe再进行安装
note：
直接安装不用再选择盘符什么的，数据都在，用U盘重装就可以
Detail step by step
Creating the Windows 10 USB flash drive
Visit the Microsoft Media Creation Tool website.https://www.microsoft.com/en-us/software-download/windows10
Click Download Tool Now.
Save the Application.
Plug your USB Flash Drive into the PC where you saved the application.
Run the Application.
Accept the EULA
Select Create installation media for another PC and click Next.
Choose the correct settings for your version of Windows 10Language (Country-china)
Windows 10( Windows 10 home)
64-bit (x64)
Select the Flash Drive and click Next.
Select USB Flash Drive and click Next.
Click Next.
Allow the application to complete. You will be prompted when it is finished and has successfully created the bootable drive.