Q: Is it possible to install Xcode 11 on High Sierra (10.13.6)? I have a Mac early 2011 running MacOS high sierra 10.13.6.
My Mac can't upgrade to higher MacOS versions.
I need to install XCode 11 to take advantage of SwiftUI.
This answer worked for XCode 10.2 but didn't work for XCode 11.
So can I install XCode11 on MacOS high sierra 10.13.6?

A: From Xcode 11 Release Notes:

Xcode 11 requires a Mac running macOS 10.14.3 or later.

So you cannot install Xcode 11 on macOS 10.13.6

A: Upgrade old macbook pro using this patch http://dosdude1.com/mojave/.
You can easily use Xcode 11.
