Hmm....
Well, you can probably proceed as you originally suggested, just click and drag cocktail to the trash and empty it, with a spotlight search to root out any stragglers.
But, I'm not following what you said in your last post:
... This message has an uninstall button, but I'm not certain which options to select in the menu it provides.
What message has an uninstall option, and what are the options in the menu it provides? If you give us more information here, we might be able to 'talk" you through uninstalling this way.
I guess you don't have a registered copy of Cocktail and that must explain why the menu options we are seeing are different.
-- JDee