I can't launch Acrobat XI. I downloaded it and a mandatory update gets an error message: Error 16820. Any suggestions?

I am very frustrated that after downloading Acrobat XI I can't use it. I get a message that I must install a mandatory update but the update won't download. I get an error message: Error 16820.
Any suggestions?@

I think this is a mandatory update for something which (confusingly) is nothing to do with Acrobat XI. See Mandadory update 2.3.0.0 gets error 16820

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Sorry I can't get the screen print to upload
It says
Mandatory Update Available
A Mandatory version of this application is available for download. Application can't continue without installing this version.
Application:     Acrobat_com
Installed version: 2.0.0.0
Update Version : 2.3.0.0
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After selecting 'Download Now' I get the following message;
     Download failed
     There was an error downloading the update. Error #16820
     Close

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I can't launch Acrobat XI. I downloaded it and a mandatory update gets an error message: Error 16820. Any suggestions?

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