Installation error on MacOS 10.9.5 with b18

Unity Engine
1

Getting the following error message when running the install:

Installation error.
Installation failed with message:
-target <[DomainKey|MountPoint|DiskIdentifier|DeviceNode|UUID]>

1896222--122119--Screen Shot 2014-12-23 at 9.09.20 AM.png

2

I’m having the same error after the files are downloaded, when it tries to install. Tried b18 and b20. Mac OSX 10.9.5 also. Wonder if it could be related to the fact that I have 2 hard drives.