It turned out it was a problem with Mac caching the code signing and not refreshing when a file is overwritten, even if the overwritten file is properly signed. We redesigned the launcher to first delete the old game file instead of overwriting, and it seems to have fixed this problem, at least for me...
Your launcher should auto-update itself next time you run it, and then download the updated game. If there's any problems, you can also download the new launcher version at
http://cdn.shadowera.com/ShadowEra.pkg
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