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I've downloaded the iPhone SDK 4 and I started the installer. Everything seemed fine until it entered into the "installation" step, at which point an "Installation Alert" dialog was raised asking me to close Xcode. I closed Xcode right away, but the dialog didn't close. I left to go out for dinner, and found this morning that the dialog was still open. I have tried starting Xcode and closing it again, and clicking on everything I could find. Finally, I tried just closing the installer using Command-Q, but apparently installers cannot be exited that way (an action sheet appeared, explaining that the installer was busy).

So....now what?

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up vote 3 down vote accepted

If you open up Activity Monitor - is Xcode listed at all?

If it isn't just force quit Installer (Force Quit menu item in the Apple menu) and open it back up.

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Restart Mac and try again.

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You may have Xcode still running on a different user account.

I had the same problem. (I use Fast User Switching.) When I quit Xcode from that account using Activity Monitor, the installer detected it and continued the installation just fine.

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