Windows installer unable to Install Air Automatically.

[InsertUser]

When attempting to install potlatch from the Windows download available here I get the message below.

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Adobe AIR
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Unable to validate the downloaded version of Adobe AIR.
Please install the latest version of Adobe AIR from
http://www.adobe.com/go/getair,
then retry installing this application.
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OK   
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The URL provided for manual install now redirects to another company which is a little confusing. After manual install of the Harman version of Air Potlatch appears to load OK, although I did manage to crash it once (I think I caused it to load a bit too much data).

Would it be possible to get auto-install working again?