If you encounter a hang at ~95% when running “Install Xcode.app“, here is how I fix that:
1. Use Activity Monitor to Force Quit the “Install Xcode app”
2. Go to Terminal and paste in following command line to uninstall all defunct Xcode:
sudo /Developer/Library/uninstall-devtools --mode=all
3. Go to Finder > Application and right click on “Install Xcode.app” then choose “Show Package Contents“.
4. Navigate through Contents > Resources. There you’ll find Xcode.mpkg which is a old style Xcode installer where you can customise to exclude iOS SDK (saving up 4.5Gb overhead) and more importantly the installer won’t freeze at 95%.