By default, macOS Catalina and later require software to be notarized before installation. This can cause issues when attempting to install some third-party plug-ins (such as TG Tools Pro and JW Plugins for Finale) to use in Finale. You can workaround this by allowing that particular plug-in through in your Mac's Security & Privacy settings. The following article from Apple can help walk you through that process: Safely open apps on your Mac


Please note that the Apple article has not been updated for macOS Ventura as of the publication date of this article. The settings are now called Privacy & Security and are presented differently: