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So crashing usually I'd not caused by Retrospect but by Kodi internals. As you are running 19-Alpha1 I would suggest you try a stable version of Kodi.
I see some other Python 3 related issues which need fixing (now that Python 3 is in the nightlies) but not crash related. I will post fixes for that soon.
I know, but not installed from the zip here in Github. They slightly differ: https://github.com/retrospect-addon/plugin.video.retrospect/releases