Purchased and downloaded Lion 10.7.1 installation doesn't work

I purchased and downloaded Lion 10.7.1, the installation icon appears on the tools bar, but when I launch it, it tells me that cannot install lions because cannot verify the software; what can I do now without paying once more time? just download it again or should I cancel some files before that? The downloading is quite misterious because Apple doesn't show anything, so it's impossible to have an idea of what's going on.
Thanks for any help
Daniela

Hi Danimauri,
Where did you purchase this from? If you got it from the Mac App Store, you'd usually get 10.7.3, not 10.7.1 (as far as I'm aware).
If you're sure you downlaoded this form the Mac App Store, I would delete the copy you've downloaded and redownload it again. Make sure your signed in with the same AppleID you originally bought it with, otherwise you may get charged again.
Hope this helps,
Morgan

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