Thanks for looking into it.
The program will tell you if OpenCL is not installed. If you switch to the Log tab directly at startup you should see info about the OpenCL installation on your system.
It says:
StyrofoamIFS by Per Olofsson
Version 28/04/2015
Dir:C:\Users\Rachel\programs\StyrofoamIFS
Name:GeForce GTX 750 Ti
OpenCL version:OpenCL C 1.2
Driver version:350.12
Global Memory:2147483648 bytes
Local Memory:49151 bytes
Constant buffer:65536 bytes
Max memory allocation:536870912 bytes
Max parameter size:4352 bytes
Max workgroup size:1024
Max compute units:5
Global memory cache size:81920 bytes
Global memory cache line size:128 bytes
Little Endian:True
Min align size:128 bytes
Mem base addr align:4096 bytes
That being said, I haven't tested on any nVidia cards (I have a Radeon myself and also tested with the Intel Core driver at work), there might be a differences.
Can you select any other OpenCL device than the one selected by default and try ?
It isn't offering me any other devices on the desktop. I also tried on my laptop, which also claims to have OpenCL 1.2. That offered me the choice of the integrated GPU, which crashed the display driver early in the render, and the Core i5 CPU, which took nearly two-and-a-half minutes to render a black screen, where the GPU on the desktop took 7.5 seconds to do the same thing. The new version doesn't make any difference.