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I updated GIMP from MacUpdates since then I got two Gimp icons in Launchpad. I also deleted the Gimp.app from finder but now i get this question mark on the gimp icon in Launchpad. How to completely remove both of these icons?
What is the cleanup step, here?
I had the same issue initially. After upgrading to the latest version of Parallels (which also solved the virtualization issue), all Windows applications were moved to ~/Applications (Parallels) at the first start of Parallels and the icons now don't show up in Launchpad any longer.
To add an application to Launchpad, you can simply drag it to Launchpad in the Dock.
But be careful — currently there's no way to remove something from Launchpad that you've added.
(And if you have items in a folder in Launchpad, you can easily drag them out and organize them as you wish.)
Best Answer
[Worked] In Yosemite open Launchpad, hold down control key and click on icon you wish to remove. A question mark should appear over the icon. Just drag and drop to Trash.