Knowing how to downgrade Apple iOS Xcode is essential if you have an incompatible xcode.
This is a step-by-step procedure on how to uninstall your existing Xcode from your Apple macOS system and install another version of the Xcode. In this demo, I am downgrading my macOS Xcode 11.3.1 to 10.3. You can download all the older versions of the developer tools and software from the link provided below. Xcode is a tool used to write Apple apps for the Apple App Store, it can also be used in conjunction with Microsoft Visual Studio and Xamarin to developer apps for Apple App Store.
You can download all the past versions of the Xcode from the Downloads for Apple Developers. However, you need the Apple Developer license to download these files.