When you click "Open Style Manager" the following box pops up.

Clicking "Get More on the Web..." takes you to http://endnote.com/downloads/styles

Click on the link and SAVE the file |
In your EndNote\Styles folder. To find out where that is on your computer, go to Edit-->Preferences-->Folder Locations.
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In my case my Styles folder is in My Documents-->EndNote-->Styles.
This style now becomes "Choosable" in the Choose-A-Style pop-up window.
