I am trying to run Xcode 6.4 on El Capitan and I can run with the instructions on this post.
But I am looking for a way to run it without any external program as I r
In addition to the original first answer if you dont want to reinstall xcode again because of slow internet connection you can just copy xcode to desktop delete the one in application folder (Assuming you did all the required steps above except reinstalling). And move back xcode to application folder(while copying to desktop itself if you did above step right you will notice the cut icon will dissapear after copying)