If you have a mid 2009 MacBook Pro, you can't update the OS. To update, you need a MacBook Pro (Mid 2010 or later) Model 6.2 and higher.
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If you are careful about what you download and where you search on the Internet, your computer is useable without the latest security updates. My last computer had a 10.6 partition which I used every night. That was after El Capitan was released, so the OS was 5 versions behind. By being careful, I never had any problems.
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I would make sure that you had at least 2 separate backups on 2 separate drives in case you have problems. That will allow you to recover.
Nov 17, 2018 8:00 PM
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Platform: Mac OS X El Capitan 10.11, Mac OS X 10.10 Yosemite, Mac OS X 10.9 Mavericks, Mac OS X 10.8 Mountain Lion Media: Software Download Customers who viewed this item also viewed.