Can I reinstall Windows 10 without a product key?

Related questions

1. Why is System Restore not working Windows 10?
2. How do I enable System Restore in Windows 10?
3. How long does it take to restore Windows 10?
4. How long does Windows 10 restore take?
5. How do I fix Windows 10 couldn't start properly?
6. How do I reinstall Windows 10 in safe mode?
7. Why will System Restore not work?
8. How do I get to restore points in Windows 10?
9. Does Windows 10 have System Restore?
10. How do I restore my computer to an earlier time?

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16. #cosmetic
17. #restrictions