Why does EM CC not add an extension that is valid but claims it is not?

I am trying to load a project 7 Dreamweaver CC extension and EM CC says it is not a valid signature.
I have talked with P7 support - the extension is valid, they can not duplicate this problem or have any reports of others having this problem.
I have had no problem installing other P7 extensions.
Computer is Windows 7. I have also tried running EM CC as admin.
Thanks
Ernie Booth
Raleigh, NC

Hi,
please click "tools"->"preferences", unselect "Allow Extension Manager to access Internet" option, and then try to install it again.

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Why does EM CC not add an extension that is valid but claims it is not?

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