I ran the exe from \AppData\Roaming\BitTorrent
It was the old version (build 45496) the settings.dat was 25KB
It looks like the new one 7.10.5_45597.exe didn't make it or just didn't save it.
https://send.firefox.com/download/e30315a2a7/#I9mnbVEsCFAp9CTWZ0yPYQ
It's probably windows 10. I'm using "skip ahead" version.
It's only crashing in torrent file maker/creation. It's NOT crashing on hosting torrent or downloading.