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how can I update mac air 10.9.5 to the more recent version?
Mac OS X Server
Back up your data, check the application compatibility table, click here, and then on the download link for a more-recent OS. Your computer can be upgraded at least as far as El Capitan.
Catalina and higher won't run 32-bit software; if you upgrade to one of them, use Go64 as well.
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