There is a bug with apple scripts that sometime causes DMG files not to launch after they have downloaded. Sidestepping this bug involves copying files from your system files onto your desktop. Please complete the following steps: 1. Copy these following files to the Desktop and restart the dmg : /System/Library/Extension.kextcache /System/Library/Caches/com.apple.kernalcaches/ 2. Launch once. You will recieve an error 3. After the first launch, shut down and restart the computer. 4. Subsequent launches of the software should now start without any issues.