This document explains how to install the Arduino Software (IDE) on OS X machines
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Copy the Arduino application into the Applications folder (or elsewhere on your computer).
When the Arduino Software (IDE) is properly installed you can go back to the Getting Started Home and choose your board from the list on the right of the page.
Last revision 2016/08/09 by SM
The text of the Arduino getting started guide is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the guide are released into the public domain.