portable Version IMac

On MacOSX, you will download a file called something like "arduino-1.6.5-macosx.zip"
Uncompressing this will give you an "Arduino.app" MacOS application (.app may or may not show up in the finder, depending on your finder options.) The .app files are Apple's way of hiding information that the user does not need to be aware of; they are actually directories.
Rename and/or copy the Arduino.app to wherever you want the portable version to live.
Open the directory by right-clicking or ctrl-clicking on the "file" and selecting "Show Package Contents"

This will reveal the internal structure, which includes several sub-directories.
Screen Shot 2018-04-05 at 10.15.15 PM.jpg
Note that unlike Windows/Linux, major arduino content like "examples", "hardware", and "libraries" are not in this first-level directory, and the "portable" directory doesn't go there either. They're one more level "down", inside the "Java" directory. Open the "Java" directory and create a new directory called "portable" inside the Java directory.

Now you can start the IDE by double-clicking the .app file in it's original spot, and it should create the various working directories and files (like "preferences.txt") inside the "portable" directory.
Screen Shot 2018-04-05 at 10.22.14 PM.jpg

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