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ML Installer doesn't find Lion Installation

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I'm tring to update my Lion machine to Mountain Lion. I've purchased the app in the App store and prepared a USB stick.

I can boot it, no problem, but in the Installation process, I'm not able to just update my Lion Installation, the Installer tells me, i have to partition my HDD before i can Install.

What am i missing, or doing wrong?


Thx for your help

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Your Lion is install on MBR or GUID partition?

If is install on MBR you need this patch for ML:


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