Do I need to buy Windows 10 for new PC?

Related questions

1. Does Windows 10 come on USB?
2. Can I download Windows 10 to a USB drive?
3. What happens if I dont activate windows?
4. How do you check if Windows 10 is activated permanently?
5. Is Microsoft offering Windows 10 for free?
6. Is Microsoft still giving Windows 10 for free?
7. Can I use Windows 7 product key for Windows 10?
8. How do you check if Windows 10 is genuine or pirated?
9. Where will I find my Windows product key?
10. Can I upgrade to Windows 10 without losing everything?

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15. #version
16. #running