OS X EI Capitan attempt to install Xcode 6.4 and Xcode 7.0.1 failure summary

Special Note: This is a summary of the failure experience, please read before the reader's attention.

1, why to install two Xcode?
I heard that Xcode 7 is very early out, I just heard that the idle Xcode 6.4 with a good, but did not want to upgrade.
September 21, looked at the Mac app Store has Xcode 7.0 official version of the update, thinking is also the time to upgrade, on the upgrade.
Then a colleague saw me upgrading, he suggested that I also upgrade the MAC system, because the upgrade will be much smoother.
L will rise, just the company's network a little pit dad, when the system, download a few times after the installation success.
And with Xcode 7.0, you're getting to know the new features of iOS 9.0.
Well, the above tricky, now into the topic: Why do you want to install two version of Xcode?
Because I am now in charge of the project minimum to eat iOS 7.0. So I personally think it's necessary to install an iOS 7.1 simulator to be compatible with iOS 7.0 testing.

2, tried and is not useful method:
The first search from the Web was the emulator installation method prior to Xcode 6. Concrete practice later found that this method simply does not work. The installation path of the emulator has changed since Xcode 6 started. For specific analysis, please refer to here: http://www.cocoachina.com/bbs/read.php?tid=231024

3, after the attempt, although it does not work, but it should be my ability to cause problems:
(1) I think about it: since it is Xcode 6, the installation path of the simulator has changed, then the installation path of the Xcode 6 to copy the file?
So refer to the method http://blog.csdn.net/zhangao0086/article/details/38491271 here, the iOS 7.1.simruntime copied to the/library/developer/ Under the coresimulator/profiles/runtimes/. The discovery also has little effect.
Continue to search online, said that Xcode 7 does not support IOS 7.1 or something. If that's the case, I'm not going to pursue it. The great God who wants to know how to load IOS 7.1 simulator in Xcode 7 can give the younger brother a little bit of advice in the comments.
(2) Since the simple copy method does not work, I finally think of a two Xcode this method.
Then I downloaded Xcode 6.4 from the official website and installed the original Xcode 7.0.1 and Xcode 6.4 in a different path, so it was installed. Of course, if the installation method is not correct, there will be a lot of errors. I also have some places not installed correctly, therefore, this installation although can use, but open iOS 7.1 simulator, always prompt unable to boot the iOS simulator.
Another problem is that Xcode 6.4 has a small problem with OS X EI: (The analog device is gone!? ）



The solution is to make Xcode 6.4 bigger!!
In this, I have not wanted to continue to toss. After all, the computer is a company, it is not good, and my own computer or Xcode 6.4, there is a test need to use their own computer test.

Here, my summary of this experience is finished. Want to know better and more convenient to install the IOS 7.1 simulator in Xcode 7 counterparts, can give the younger brother to make a suggestion, younger brother greatly appreciated.

PS: In Xcode, if you are prompted to install the emulator after downloading the emulator, start Xcode with the command line. Specific references are as follows:

http://blog.csdn.net/mengxiangyue/article/details/48413281

OS X EI Capitan attempt to install Xcode 6.4 and Xcode 7.0.1 failure summary