- The latest version of Xcode that can be used with El Capitan is 8.2.1 see: Note that you must have macOS El Capitan 11.
- Can I install xcode 8.3 without updating my Mac's OS i.e. 'OS X El Capitan' (Version 10.11.6) I was not able to find any reference on Apple's site, However, this link says I can't.
- Xcode 8 beta 6 requires a Mac running macOS Sierra beta 3 or later, or OS X El Capitan 10.11.5 or later. MacOS 10.10 is an unsupported configuration and is not supported by Xcode 8. Your only solution is to update to 10.11.
The issue is for XCode 7 beta versions too. I have tried the latest one available as of today on developer.apple.com. I think it is related to OS upgrade to El-Capitan as Simulator downloads work pretty fine for my other colleagues working on Yosemite still, for both XCode 6.4 and XCode 7 beta versions.
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