which is the latest OS I can have in a late 2009 MacBook unibody
Did you know which is the latest OS I can have in a late 2009 MacBook unibody
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Back up your data, check your applications for compatibility, and depending on the current OS version, download El Capitan or High Sierra.
If it's running 10.6.8 through 10.7.5, use the El Capitan link first.
If it's running 10.6 through 10.6.7, update to 10.6.8 first.
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