Xcode 6.3 not running iOS 8.4 - update to 6.4 fails

问题

I have upgraded my iOS to 8.4, then I tried to run Xcode 6.3, it asks it can't mount the device since it's running 8.4 version (".. running a version of iOS that is not supported by this version of Xcode.") When I try to upgrade Xcode to 6.4 - update fails every time with error message (try again using purchases).

Any suggestions how to solve this?

回答1:

• Delete /Applications/Xcode.app.
• Download Xcode 6.4 from the Apple Developer Download site.
• Mount the .dmg and extract Xcode.app into /Applications.

回答2:

You don't need to delete /Applications/Xcode.app.

1. Open a terminal.
2. Copy this: xcode-select --install and paste it in the terminal
3. Install.
4. After the install has completed, you can see in the App Store that is possible to update your Xcode.

I did that and I can update my Xcode from 6.3 to 6.4.

回答3:

What I've done and worked..Open the Mac App Store, search for the Xcode, check that it shows the latest version and then click install. It will start to downloading and installing the latest version.

来源：https://stackoverflow.com/questions/31320463/xcode-6-3-not-running-ios-8-4-update-to-6-4-fails