macos - This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted or tampered with during downloading - Ask Different
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OS X El Capitan - Wikipedia
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OS X El Capitan System Requirements & Compatible Mac List | OSXDaily
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Identify your iMac model - Apple Support
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Apple MacBook 10 Years Later: Retro Review (Early 2009 Core 2 Duo) - YouTube
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