I've tweaked the Blender exporter so that it will now create a new .OCS if the project that you have supplied doesn't exist.
If you've not been following my other thread, a quick summary. Lionel's Blender export script got broken. It no longer works for Octane above version 1.20. The main reason for this is that Lionel's script tried to export all the materials inside the .OCS file. The format of the .OCS has changed and so the script stopped working. I have stripped out all the writing of materials etc. Now all that happens is that the .OBJ/.MTL files are generated and Octane called.
Give it a go if you want. You install it just like the old exporter straight from the .ZIP file.