I can not run Xcode 7.0.1 on my MacBook Pro (Retina, 13-inch, Late 2013, 4GB of RAM, 128GB SSD, 20+GB of free space, OSX 10.10.5). I downloaded the DMG file from Apple, and can run it on my Mac mini (Late 2012, 16GB of RAM, 1TB HDD, 200+GB of free space, OSX 10.10.5), but can not run it on my MacBook. The DMG file seems intact and I can browse the contents of Xcode.app; it is seamlessly copied to /Applications folder. There is no error code or whatsoever, except the phrase "The application "Xcode" can't be opened."
Xcode 6.0.1 runs perfectly on my MacBook.
Any thoughts?
UPDATE
I tail ed /var/system/system.log as patrix suggested and here's an interesting line:
kernel[0]: exec of /Applications/Xcode.app/Contents/MaxOS/Xcode denied since it was quarantined by Microsoft\x20Remote\x20Desktop and created without user consent, qtn-flags was 0x00000006
WTH?
Best Answer
Something similar happened to me when I first downloaded Xcode 7 onto my MacBook Pro. My solution was to copy the app onto my external hard drive, delete the copy on my internal drive, run the app on the external drive, then copy it back over to the internal drive. I've never had any problems with Xcode 7 since.