Users will currently have to manually remove the quarantine flag on the macOS Helper app or they'll get a damaged/corrupt app warning. This is due to macOS no longer allowing unsigned apps downloaded over the internet to run. Instructions are here: https://portableapps.com/download/macos#installation
We've applied for the Apple Developer Program and paid our $100/year fee. Once our application is complete and we've set up our signing certificate, we'll be releasing a signed version to alleviate the quarantine issue.