Why is Resharper 5.1 missing from the Add-In Manager dialog?

When I ran R# 4.5.x, there was a Resharper entry in the Add-In Manager (Tools/Add-In Manager).  Now that I've installed 5.1, the entry is no longer and I can't disable Resharper on as-needed basis.

How can I get the Resharper entry back into the Add-In Manager?
This is with Visual Studio 2008.


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