Move Xcode 5 to the Trash. Download and install Xcode 4.6. You can download older versions of Xcode from the following URL:
https://developer.apple.com/downloads/index.action
You can also have both Xcode 4 and 5 installed. You will have to rename your existing Xcode 5 app from Xcode to another name like Xcode5 before you install Xcode 4.6 in the Applications folder.