illegal is illegal, i dont know if i understand you correct, do you mean your downloading only a peace of the program without some files it needs and later downloading the other peace so that it does work.

or just downloading part of a part of software that already works even without that missing peace?

becouse my teacher say's you may not download a movie, but if you download 2 programs and put them together and that makes 1 movie it is legal but if i were you just dont do it even i am not sure if it is legal or illegal