Hello, I'm trying to open ZQuest Editor on my Mac. I'm on macOS Sierra Version 10.12.1

Whenever I open it, it shows a small window, reading "Loading Quest" at the top. And then it says this:

Loading Quest: new quest...
Decrypting...error.
-- press a key --


When I do press any key, nothing happens. Whenever I hold down a key for a few seconds, the editor finally crashes. I've tried the versions 2.50.3-RC 1, 2.50.2, 2.50.1, and 2.50

Please help!