osx elcapitan - Xcode 6.4 on OSX 10.11 (El Capitan) beta 2 / beta 3

Question

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 ran before with OSX 10.10 (Yosemite).

I found this post that point to this instructions but it does not work. These are the instructions

1. Open this file /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/Exception.plist
2. Find lines with name xcode in them (http://i.imgur.com/tcKWLhz.png)
3. Edit value HardDisabled from YES to NO

4. Save and reboot

   1.a) If you can't save because file says it's locked then enable rootless mode (sudo nvram boot-args="kext-dev-mode=1 rootless 0" or sudo nvram boot-args="kext-dev-mode=1 rootless=0") and reboot.

   1.b) If you still have problem, copy Exceptions.plist to Desktop (or wherever else) and edit it them.

   1.c) Save it and them remove Exceptions.plist in System (sudo rm -rf /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/Exceptions.plist)

   1.d) Copy file from Desktop (or wherever else) to /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources and reboot.

I couldn't edit the Exceptions.plist file with the instructions above, but after a lot of tries I found the way to edit it.
Here you can find the instructions to edit it.

After all of this, I still receiving the message

You can't open the application "XCode.app" because it is not supported on this type of Mac

when I try to run Xcode 6.4 from Finder

SOLUTION 1
The only thing I didn't do was to reinstall XCode 6.4 after the changes. I reinstalled it and it works!

SOLUTION 2
Dave Wood provided another solution to avoid to reinstall XCode. This is is post and as he posted in his answer the script is here

Answer 1

Here's a shell script that tweaks Xcode 6 and resigns so you can just run it normally. No need to mess with the system exception list, reinstall or anything. Just takes a minute or so to run.

Script is here: http://bit.ly/Xcode6OnElCapitan

Note: you can not submit apps built on El Capitan while it's still in Beta.