I have just purchased Fotomagico Single User Pro. I have downloaded it successfully. When I try to install by dragging the Fotomagico icon to the Applications folder, I get a message saying that this action can not be completed because ‘the item DockTile is in use’. I do not know what DockTile is and I do not how to close/get rid of it so I can complete the installation. Any suggestions on how to proceed?