CaptainBonwick

Had the same problem at first but I managed to figure out what caused it. I unzipped the file with Keka at first and when I tried to open Nimbatus.app I got the same error. So here is what I did to fix it: 1. Unzip the zip file with the build in archive app from MacOS 2. Right click Nimbatus.app and Open That's pretty much it, hope it could be of use to someone.