You can use the Radio button artifact as affordance to represent that it's a list which permits single selection, meaning that a user can not have more than one application selected. But for visual feedback of what is currently selected you can make use of a whole lot more visual cues. Different background of the list item, bold font, coloring, indent (maybe not though, but you get the picture).
You don't have to stick to a radio button being the only visual feedback of selection, let that aspect instead cue the nature of the selection, with it being single selection. For item selection feedback you can use more visual cues, list item background probably being the one I would go with.