Here you can find all the versions of LuxRender that are needed to use with Reality. Please note that you can have as many versions of LuxRender as you want, all that is needed to be done is to install each version in a separate folder.
The Windows version of the program might ask to install also exporter scripts for Blender or other 3D program. You don’t need to do that as long as you use Reality. Installing the exporter scripts will prompt you with a location where Blender is installed. If that happens, and you don’t have Blender installed on your machine, simply go back to the beginning of the installation and uncheck the installation of the exporter scripts.
The Mac OS version is enabled for OpenCL acceleration and it runs only at 64-bit. You will need need Mac OS 10.6 or above. OpenCL is a feature that is built inside Mac OS. The results of using it depend on the type of GPU installed.
For Windows you have the choice of 32 or 64 bit versions, with OpenCL or not.
OpenCL (please note that it’s different from OpenGL) is a technology that allows programs to accelerate some operations by using the processors int he GPU. If you are not sure if your GPU is OpenCL-compatible simply download the non-OpenCL version. You can always change later.
A Note about OpenCl and GPU acceleration
While LuxRender provides support for GPU acceleration, that support is limited to certain types of calculations. GPU acceleration requires a certain expertise with Lux and so we strongly advice against using it while you are becoming familiar with Reality and LuxRender. Start with standard CPU rendering and master that part of the Lux/Reality process. You will get beautiful images with exceptional realism.