MacOS 15.0 DB + Xcode 15.4 Not Supported

Developer Tools & Services Xcode
hankes12345 OP
Created Jun ’24
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I am currently on the MacOS 15.0 Developer Beta and successfully installed Xcode 16 beta through Xcodes which renames the Xcode App to Xcode-16.0.0-Beta.

I am trying to open Xcode 15.4 (which I just reinstalled and is also renamed appropriately to Xcode-15.4.0) but every time I try to open this version of Xcode I get the following error:

This version of Xcode isn’t supported in this version of MacOS

The older Xcode versions (15.4 and below) have a slash through their icon and will not open either.

I have a few coworkers who have also encountered this issue.

Based on an earlier post, it sounds like we should be able to run both side by side on the MacOS beta. Is this indeed the case or is there some issue surrounding this?

Earlier post

Answered by DTS Engineer in 790293022

macOS Sequoia 15 Beta requires Xcode 16. To run both Xcode 15.4 and Xcode 16, you need to use macOS Sonoma 14.5.

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DTS Engineer OP
Apple
Jun ’24
Accepted Answer
Recommended

macOS Sequoia 15 Beta requires Xcode 16. To run both Xcode 15.4 and Xcode 16, you need to use macOS Sonoma 14.5.

2
outcoldman OP
Jun ’24

There is some workaround to launch it, obviously not supported by Apple.

https://x.com/outcoldman/status/1800536970965487821

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MacOS 15.0 DB + Xcode 15.4 Not Supported
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