The good news is that Apple MacOS license permits you to create any VM and reinstall older MacOS/OSX versions inside the current version, and use both the older and the current simultaneously. You can do it with VM Ware Fusion for MacOS.

Use it to compile or migrate your code to current/newer Xcode syntax, or keep working on it using the older Xcode directly inside the VM on your current MacOS Mojave machine. In short, you can't install too older Xcode versions on the current MacOS versions, you can only install the most recent Xcode versions.īut you need Xcode 8 (and I think it runs on El Capitan).Ĭonsidering you must use an older Xcode which cannot be installed on your current system ( I have the same situation, which you posted the Xcode Swift3 message), the easier solution is to install an older MacOS version inside a Virtual Machine on your current macOS, and install the older Xcode on it.Įg: If you use Mojave, create a virtual machine of El Capitan and install the older Xcode 8 on it.

Xcode 10.1 download