Need someone to bake Displacement maps in ZBrush

I bought some model for $160(O_O) in Turbo Squid but it came with 1024x1024 normal map textures and no height maps. (My fault I didn't read those are 1024x1024 with no height map).
Anyway, in addition to the low poly model, I also got the ZBrush high poly model. I thought maybe I could bake displacement maps from the high poly model, but I don't own ZBrush.
The biggest issue(which I don't know if ZBrush will solve), is that on the stiches where the texture is fractured(the arm mapping is not connected to the toroso mapping) I need the displacement maps to have the same values. Otherwise displacement will cause gaps to appear in the mesh.
So, if anyone got ZBrush, maybe you can help me out?
(I tried to find a trial version of ZBrush but I didn't find it, maybe I didn't look good enough).