Because the box is grayed out. And it says (new and improved) next to the grayed our box. Same with supports. But once again that in not my problem. Should makerware connect to my printers as the replicator duel or the 2x? Everything printed great until it switch to the left extruder. Then it when haywire. The left extruder seem like the print bed is way left of its actual position. Maybe it's a slicing error??