Hoping you're still active... I just picked up this tool, and it worked great for me except that the index is an empty file. The topics all seem to have exported just fine.
(I noticed something odd which may be related—when selecting the source file, the converter didn't see my RW export file. I had to copy & paste the filename, which it accepted. Could that have something to do with it?)
I'm also in the pre-KS beta team, if that might have some impact.
Even if you can't help me with this, being able to export my topics is still super helpful, so thank you for this tool!