I understand that this is a pretty basic question but I cannot find a direct answer anywhere. I have two computers running Snow Leopard: a Macbook Air (2011, pre-thunderbolt) and MacBook Pro 2009, which can both run Mountain Lion. According to my programmer / Apple friend, I can download Mountain Lion once from the App Store and use it to upgrade both machines. Is this true? I'm using one 'account' I guess but it's still two different machines, but my (trustworthy) friend was insistent I could. I can't find confirmation in any of the reading I've done here or on the Apple website.
MacOS – How many copies of Mountain Lion does one App Store download get me
macos
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Best Answer
You can install Mountain Lion on several Macs, provided that you use the same Apple ID for downloading it on them.
The Mountain Lion License Agreement explicitly says:
You can read the license by clicking the Terms and Conditions link at the bottom of the App Store window (left of the FAQ currently) and searching the license for the words "product usage" (presuming your store's terms are in english).