this question should be in the forum "Eviews 5 and LATER"

I have the following problem: I need to go through some estimations I did some years ago using Eviews 6.0 [I have the workfiles saved but I did the estimation on the office pc] however on my computer I only have eviews 5.0.
My guess was that these two versions should be quite similar, however when I re-run a NLS estimation of an equation in eviews 5 I get completely different results, even if I set the same starting values, the same estimation settings, and obsviously the same optimization algorithm...Do you know what might be happening? please help, I really need to sort this issue out quite urgently!
Thanks in advance!