This isn't compatible with the latest versions of macOS as it is only compatible with 32bit, something that the previous two versions of macos have not included.
Thanks for the info. I've been confused over why some people got it to work while others couldn't, but then this is probably the reason.
LabChirp is built using the "Any CPU" option in Visual Studio, so it should work for both 32- and 64-bit systems, but I don't know how Mono handles that.
photoshopped these two snippets from the error message together, most of the struggles appear to be related to this. Probably not much you can do on your end to resolve it :(
Thanks again, and I'm afraid you're right; there's not much I can do except rewrite the whole thing or hope Mono adds support for 64-bit.
Perhaps I should remove the mac compatibility flag on itch.io.