How to deselecting other FO:NV add-on. For example it lists, Lonesome Road, Old World Blues, classic pack so on. I have unselected them in game but the G.E.C.K. will not allow it. And when I try to set the FO:NV as the active file the G.E.C.K. crashes, to many data files selected.

Problem solved. Double clicking deselects the files.