I'll give it a go and let you know, though pressing command key is new to me
My programmer recompiled and reuploaded the mac file. Redownload and it should be working as expected now!
For Reference’s sake:
So I had my folks look into this more, and it looks like there was some compiling issue that’s breaking the default macOS unzipper. Using a third-party unzipper (they were using https://theunarchiver.com/ ) works just fine, which is why we didn’t catch it initially.
So that’s a temporary solution in the event this happens again. But it looks like a simple recompile on our end fixed it with default macOS.