Jun 23, 2015  OS X 10.11 El Capitan is currently only available to registered developers, but Apple plans to offer a public beta of the software in July. Following testing, El Capitan will see a final release. Oct 24, 2019  If your Mac isn't compatible with OS X El Capitan, the installer will let you know. Make a backup. Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available.

I can't open XCode 6.4 on El Capitan. The icon has the disabled mask over it, and every time I click it I reviece an alert: 'The version of Xcode installed on this Mac is not compatible with OS X El Capitan. You have “Xcode” 6.4. Download version 6.4 for free from the Mac App Store.'

Xcode 9 El Capitan

Does anyone else have this issue? Did anyone else figure out how to fix it? I already tried deleting XCode and reinstalling it from the Mac App Store. I am definitely running XCode 6.4 as the alert says is required, but it won't open.