The error seems to point at the app not being signed by apple. Can you find out if your dev has access to an apple developer account? Apple apps need to be signed in order for them to work on a mac or apple refuses to let them open and there's no work around.
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The mac version of the generator is still broken and has been for over a year. Is there going to be a fix for this? There have been multiple reports. The posted "solution from a patron" only applies to apple silicone, and not to Intel Macs, which seem to be the majority of the people having issues from what I can tell.
For the stable build there's not much we can do since we're maintaining compatibility with Godot.
You can try optimizing your build for size and see if that helps:
https://docs.redotengine.org/en/stable/contributing/development/compiling/optimi...
Hey, just bought these(amazing work by the way, I recently purchased your village set and it's great). It seems the generator doesn't work on mac. I'm using a 2014 mac with Big Sur, and the app continually crashes, and that's after I had to do some terminal fiddling to get it past mac's crap security options. Any help would be appreciated. Thanks. I can send a log if needed from the crash, if that helps.