HT201475: Upgrade to OS X El Capitan
Learn about Upgrade to OS X El Capitan
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Helpful answers
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Sep 3, 2016 12:11 PM in response to Alice Aliceby Csound1,The answer depends on which Mac you have, and how old it is. Can you tell us?
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Sep 3, 2016 12:34 PM in response to Alice Aliceby Barney-15E,★HelpfulIf you haven't been downloading all of the released OS's, you will have little choice as to what you can upgrade to regardless of what Mac you have.
Of the OS's after Lion and excluding El Capitan, Mountain Lion is the only one that can be installed--and you have to purchase it.
Deciding which of those two would depend on your hardware as Csound1 has asked.
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Sep 3, 2016 12:46 PM in response to Alice Aliceby Csound1,★HelpfulThen you can (and should) upgrade to El Capitan (which is free from the Mac App Store)
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Sep 3, 2016 2:31 PM in response to Alice Aliceby Eric Root,Check to make sure your applications are compatible.
Applications Compatibility (2)
El Capitan 10.11 Compatibility information
Also check to make sure there is a compatible driver for your printer.
Do a backup before installing, preferable 2 backups on 2 different drives.