Okay, that at least answers the second question.
I assume it's
(without the white spaces, '64bit' instead of '64' and 'vsViewer.exe' instead of 'vsViewer')
So what happens if you start vsViewer from there?
C: / Program Files / Hybrid / 64 / Vapoursynth / vsViewer
C:/Program Files/Hybrid/64bit/Vapoursynth/vsViewer.exe
So what happens if you start vsViewer from there?
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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.