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Since the update "escape from the castle" is build 1359, and the mac version of Shadwen here is still 1319 I suggest you to wait for an update.
I contacted both gog and frozenbyte support with screenshot (I downloaded the game several times because they both think it is updated), but this time I show them many screenshot with both the installer/version of the game dowloaded by me on gog (shadwen_2.2.0.3.pkg) and the build in-game:
I write here too because they asked me to download it several times so that you can save time if you use mac gog version.

EDIT. they updated it
Post edited August 13, 2016 by LiefLayer