When I tried to boot Xcode 8.3.3 after upgrading the operating system to Mojave,
Unable to open Xcode due to problem
Verify Xcode works with this version of macOS
The error
appears.
Does mojave only support the latest Xcode?
As a supplement to what がйка さん has already written, Apple's Developer Forum has also reported that Xcode8 does not work in Mojave.
The theme was "I want to use Xcode8 for the transition from Swift2 to Swift3", so the thread length is extended, but there is no response other than "Give up (move Xcode8 on Mojave).
(I saw some of the same questions on StackOverflow in English, but I couldn't find any meaningful answers.)
Also, Xcode8 cannot be used to develop iOS apps to register with the App Store
Upcoming iOS 11 App Update Requirements
Announcement that it is necessary to build with Xcode9/iOS11 SDK when registering updates to existing iOS apps in the App Store.(Valid from July 1, 2018)
Build Your Apps for iOS 11 and iPhone X
Announcement that new iOS apps need to be built with Xcode9/iOS11 SDK when registering in the App Store.(Valid from April 1, 2018)
I don't understand why you want to use the old Xcode, but Apple sometimes slashes the old one, so it's better to move to the new Xcode quickly.
By the way, Mac OS downgrade is not supported, so you have to get the installation image of macOS (Sieera or High Sierra) you want to deploy and then "clean install".If you have an external bootable HDD/SDD, you may be able to install the old macOS on it.
The release date of Xcode 8.3.3 is June 2017, but the supported OS is 10.12, so if the OS version is different from 10.14, it is possible that it is not supported. I think Xcode 10 is essential because the new features of 10.14 and the Swift version are increasing.
If you are hesitant to switch from Xcode 8 to the latest Xcode because you do not want the Swift version to go up, we recommend that you take this opportunity to rewrite the code you are developing to the latest Swift.
On the other hand, if you can't easily access the source code for business, you should keep the development OS and Xcode in place and have a machine (or partition) to verify the operation of OS 10.14.
Additional information
@ Mr. Takataka, you may be able to back up the entire disk first, then fully initialize the disk, and then download the 10.12 (Sierra) installer, which is private from the AppStore with the command-line tool mas. Mas is a tool that allows you to download the AppStore application from the Terminal command line (although I think you can download only purchased or free).
Please check the product ID of Sierra, High Sierra by searching the internet using mas product ID etc.
I don't think it's going to change, but it's a bit irregular, so I'd like to refrain from listing each product ID directly here.
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