The error you are encountering is likely due to macOS's Gatekeeper security feature, which can block applications from unidentified developers. To resolve this, you can try the following steps:
- Open "System Preferences" and go to "Security & Privacy".
- In the "General" tab, you should see a message about Spine being blocked. Click "Open Anyway".
- If the issue persists, ensure you have downloaded the correct version of Spine for your Apple M4 chip. Since the M4 chip is not officially mentioned, ensure you are using the latest Apple Silicon version of Spine, which should be compatible with newer Apple chips.
If these steps do not resolve the issue, it might be helpful to check if there are any additional security settings or antivirus software that could be interfering with the installation.