Access previous simulations in simulate lite,

I have Creo 2.0 and the simulate lite package that came with it. I ran a few simulations on single components and I am trying to access the old simulations I already ran and just change the forces and constraints as existing instad of doing everything all over again. When I try to open the files, Creo tells me that I do not have the license to access the files and when I try to go through creo to open them, Creo does not see the files. Any ideas?