1, Enter the App Store application, click on the avatar in the upper right corner

2, Click to log out
"Log out" needs to drop down for systems above iOS13

3, Back to the top

4, Enter the Apple account in the US and click to log in

Note: Search through a treasure: AppStore account
you can get an Apple account in the US

5. After logging in successfully, search for [Gemini DNS] to download