Eject the DMG at bottom left of Finder, then launch Audacity.app from /Applications or from your chosen location.Do not double-click the “Audacity” icon in the DMG to launch Audacity from there.Alternatively, drag the “Audacity.app” icon to any other location of your choosing. Drag the “Audacity.app” icon in the DMG window to the /Applications folder icon on the right.Double-click the downloaded DMG to mount it.If you use the optional FFmpeg library you will need to download the appropriate version of it.