Add the file to your Captivate install directory Gallery > Interactions folder. (Make a backup copy of the original file in case you need it later.)
E.g. C:\Program Files\Adobe\Adobe Captivate 6 x64\Gallery\Interactions
Make a note of the name of the interaction. Then open a new Captivate project and from the Insert menu, select Interactions.
Find the interaction in the screen and insert it into the slide.
Then configure the interaction, publish and test.
