if im not mistaken, all you would have to do is click once on the career.lg folder and it should extract it right over that and over write it, if not open up the roster file that you would be using and get real simple and cut and paste everything to it to ensure that it overwrites it, that is what i did a LOOOONG time ago when i first started playing with add-ons, if that doesnt help, maybe i can walk you through it on email?
duckfart76@comcast.net