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How do I install OS 10.8 on ex HD from Mac running OS 10?

Am running OS 10.9.4 Marvericks on a MacBook Pro and want to download OS 10.8 Mountain Lion and install it on an external HD that is running 10.6.11 Snow Leopard. When trying to download Mountain Lion from the App store onto the main drive it wants to replace Mavericks. I need to find a way to download it onto the external HD (which is a 500 GB HD in an enclosure from my old MacBook Pro). When I tried booting with the external drive by using the Option key, it shows both the main HD running Mavericks and the external drive, but when I choose the external drive and hit Enter, it doesn't do anything. I can't get the external drive running Snow Leopard to load. Does anyone have a solution? Thanks, Phil

MacBook Pro, OS X Mavericks (10.9.1)

Posted on May 28, 2015 10:15 AM

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How do I install OS 10.8 on ex HD from Mac running OS 10?

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