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Autocad 2011 for mac won't install on macbook air

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Pressing 'ok' is followed by message 'To download and restore Mac OS X, you computer's eligibility will be verified with Apple'. Selecting option 2, 'Reinstall Mac OS X', I am offered to install OS X Lion 10.7 (the original OS the machine was shipped with). Mac OS X Utilities menus load, no problem here. Seems to suggest that there's no recovery partition, or it's not recognized, right? grey screen, then automatically switch to Internet recovery mode. No visible progress for about 30 seconds, i.e.

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No surprise, since the system partition has been erased. regular startup: Bootup stops at question mark screen. I have now been trying to re-install OS X on the MBA, but didn't succeed. Before doing so, I erased the default system/home partition with Disk Utility in Recovery Mode.

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The machine came with OS X Lion pre-installed, and has been upgraded up to El Capitan while I used it. I'm trying to reinstall OS X (Lion, or higher - which version doesn't matter to me right now) on a Macbook Air, 11-inch, Late 2010 model. Hoping someone here has a different idea. Tried every suggestion I could find on the net, but nothing worked.