Can't download Moutain Lion

Hello ,
Can´t download Mountaimn Lion. When clicking on buy it says (German) :
"Die Produktverteilerdatei konnte nicht überprüft werden. Möglicherweise ist sie beschädigt oder wurde nicht ordnungsgemäß signiert."
What can I do ?

I don't know. Can you explain exactly what process you're taking, and what happens when you try?
Also, are you absolutely sure your Mac meets the following specs? What year is it?
http://www.apple.com/osx/specs/
Matt

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    If you sign into the App Store and try to purchase Mountain Lion but the App Store says your computer is not compatible then you may still be able to upgrade to Lion per the following information.
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             4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
             5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
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         For a complete How-To introduction from Apple see Upgrade to OS X Mountain Lion.
    B. Upgrading to Lion
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