molamola When the window appears, click the Done button, and then open the Privacy & Security section in System Settings. Click the lock icon and press "Open Anyway".
Why does this warning appear? Because macOS has a security feature called Gatekeeper that prevents the installation of software from sources other than the Mac App Store or “unidentified developers.” We take security very seriously, and we guarantee that the Spine installer and installed application are completely free of viruses and malware, so you can install them with confidence.
