at the moment, the converter tool is not available for download. It doesn’t work with the latest version of our plugin anyway. Alternatively, you can render directly to a .exr image rather than a .vrimage, which then has to be converted using that tool.
-edit-
I’m sorry, I was referring to the latest version of VfS and the beta of VfR (which is not public yet). I forget that the 1.05 version of VfR doesn’t support this yet. I will give someone a tap on the shoulder again about this converter tool. Unfortunately I myself am not able to do anything about it, but hopefully someone here can.