Installed XCode 6
on Mavericks
. It din\'t run. Updated OS to Yosemite 10.10
: Now Xcode.app (installed through *.dmg) launch fails wit
Some times in below options
Allow apps downloaded from contains only 2 options "AnyWhere" is missing for that open your terminal and add below line
sudo spctl --master-disable
enter your system password. Now you quit System Preferences and reopen it System Preferences/Security & Privacy/General now "AnyWhere" option will be there. Hurrah You have done it.
hope it will work for you.