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Q: How do I download El Capitan to an external HD to test it first

I want to test El Capitan with my programs/software on my computer FIRST before downloading to my computer. I am running Yosemite 10.10.5 now. I have backed up my computer and have a large capacity external HD. Please tell me how to download TO the external drive without downloading on the computer HD. Please tell me how to start up the computer to the HD to test it after downloading

MacBook Pro with Retina display, OS X Yosemite (10.10.5)

Posted on Nov 11, 2015 10:42 AM

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Q: How do I download El Capitan to an external HD to test it first

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