Still with latest builds of macOS Sierra (16A304a) Capto will crash on initial launch (Click Reopen launches app), Trying to select Preferences in Capto = crash. Surely this can be easily addressed, recall the exact same behavior on El Capitan builds with Voila.
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We have already worked on Sierra compatible version of Capto. We suggest you to send us the entire crash report to diagnose the issue closely. Also, you can take part in the beta testing.
Reinstalled via MAS and is working now - thx