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Got it!

1. Copy SageMath-9.0.app from DMG to your application folder. Don't rename it
2. Right-click the app, select open and confirm you want to open it
3. You get a message saying Jupyter failed to start
4. Quit SageMath-9.0.app
5. Open terminal.app and enter cd /Applications/SageMath-9.0.app/Contents/Resources/sage then ./sage
6. When you see the invite sage: enter quit()
7. You can now launch SageMath from the Finder as usual.