Problems downloading/installing Acrobat from the app manager

I am getting the following message when attempting to download Acrobat. I do not know why it's no longer installed on my computer, nor why this message pops up:
Adobe Genuine Software Validation Failure. The product you are trying to install is not an Adobe Genuine Software and appears to be counterfeit.
How can this be? I am attempting to install software directly through Adobe- how can it be counterfeit. Any suggested solutions welcome.

http://helpx.adobe.com/x-productkb/global/digital-certificate-revoked-aam.html

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