This release merely exists to provide a pre-built macOS app package bundle. This bundle is not signed and will cause an unidentified developer warning. To run the application, follow the instructions at https://support.apple.com/kb/ph25088 (you do this at your own risk, you should not run applications from publishers you do not trust).
For the Windows release of this version please go to the official release source at https://github.com/crowbartools/Firebot/releases/tag/v4.13.2