Of course, I installed the free version and I have no problems for the animation, but since I saw that only one GPU was used, I returned to version 4 to be able to use the 2 GPUs.
But this version 4 of OCDs always when I reach 110 frames rendered in animation comes out error and I have to restart. I tried the IRAY even so with 2 GTX TITAN X the IRAY render engine is very slow. Actually I have another GTX TITAN X and a GTX TITAN Z saved, since I have another motherboard I will install all 4 cards together.
But taking 3 GTX TITAN X and a GTX TITAN Z accounts anyway, I think IRAY would remain slow compared to Octane Render for DAZ Studio.
I rendered the face of a woman with hair with IRAY (2 GTX TITAN X) and it took 10 minutes for a single frame. With Octane Render for DAZ Studio it took 1 minute and 25 seconds, of course they are not the same conditions but for the quality that is achieved it is acceptable.
I think I retract and I will have to get the latest version of Octane Render for DAZ Studio. I better pay OTOY the cost of the new license, than having to pay a high cost of electric power rendering with IRAY.