Got the source, good news I can reproduce the crash when using Vapoursynth, so it's nothing on your system that is causing this.
(I also wrote a small 'Step-by-Step' Convert to 60fps.)
Cu Selur
(I also wrote a small 'Step-by-Step' Convert to 60fps.)
Cu Selur
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.