So that took a little longer than I thought it would... the blame for this lies solely with Disgaea D2.
New RC is out, and it should actually work this time.
There's a few known bugs, but nothing is a deal-breaker as such:
- Progress bar sticks at 99%, even after patching has completed.
- CLI mode is untested, but probably won't work due to bugs in either Windows or the Python implementation on Windows. Not sure which.