I've two Macs: one MacBook Pro Core 2 Duo with 10.5.8 (Leopard) and the other MacBook Pro Core 2 Duo with 10.6.8 (Snow Leopard).
How can I upgrade the Leopard Mac to Mountain Lion while leaving the Snow Leopard Mac as it is for now.
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Most of what you need is in this Ars Technica article.