In my case, I copied the 13.3, 13.4, and 13.5 folders from Xcode 11.4.1 into my 11.3.1 App. Copy the support folders you need into the above folder on your computer.
XIP format, extract the contents, resulting in an Xcode.app package, and open the Xcode.app package contents. Long time ago I used a DMG (needed to install an older version of the command line tools, but thats another story). I'm trying to download Xcode 7.3.1 here: It is a 4.8 GB file.
To get the right device support file, you can download the latest Xcode package from in. Yes apps that you build using old Xcode versions should run OK on newer OS versions but they can only be distributed ad hoc. In my case, the Xcode 11.3.1 atform folder contained subfolders containing support files for all iOS versions from version 8.0 up to 13.2. (hint: To open the Xcode.app package in Finder, right-click on Xcode.app, and Show Package Contents in the context menu) Method 1 Download and install from the App Store Method 2 Download and install from the Apple developer’s site Method 3 Install the Command Line Tools (CLT) How to update Xcode on Mac How to test your Xcode apps How to test your iOS app on XCode What is Xcode Xcode is an IDE developed by Apple. The support files go into the following folder: /Applications/Xcode.app/Contents/Developer/Platforms/atform A quick reference video on where and how you get the older version of Xcode.In fact, this applies to all version of tools for Apple Developers.
Rather than updating Xcode, the solution is to install the device support files. When running an app on the iPhone (rather than the simulator) in this situation, Xcode displayed an error, saying it could not locate device support files, a spinner, and only an option to Cancel Running: I recently ran into a situation where I wanted to hold off upgrading to MacOS 10.15 (Catalina) but needed to develop and test on my iPhone XS running iOS 13.5, which requires Xcode 10.4 that only runs on Catalina.
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