Designer 5 Not Opened: Apple could not verify “Designer 5” is free of malware

To fix the “Designer 5 Not Opened. Apple could not verify “Designer 5” is free of malware” error on Mac, open System Settings > Privacy & Security, scroll to the security section, and click “Open Anyway” for the app.

Step-by-Step Fix:

1. Go to Apple Menu > System Settings.
2. Click Privacy & Security in the sidebar.
3. Scroll down to the “Security” section and click Open Anyway next to the notification about Designer 5.