Download to Macintosh

Hi! i recently brought a Macbook 2.0 ghz mac osx. i downloaded the lates arduino software from the sight, and when i try to open the program after i installed it, it comes up with this message...

Uncaught exception in main method:
java.lang.UnsatisfiedLinkError: /Users/myname/
Downloads/arduino-0015-3/Arduino 15.app/
Contents/Resources/Java/librxtxSerial.jnilib:

Arduino java.lang.UnsatisfiedLinkError OS X error solution.

--Phil.