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Operating System
I have OX 10.9.5 on a MacBook Air purchased 2014. How do I update the operating system to 10.10?
How to get macOS Sierra - Apple Support
As Johnathan states you cannot upgrade to 10.10. Your Mac supports Sierra, so use his link to install Sierra.
MacOS Sierra - Technical Specifications
最后更新：2017-08-28 09:14:12
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