Is it the Rapid Release Update?
Purchases of K4 who pay for Adobe updates get Rapid Release Updates. These are updaters created by Adobe. They have been tested by MEI. Just think of early updates before they are available to the public.
I do not know if they are related to the problem of opening articles in InCopy CS6 and getting a message about a missing plug-in, but both the 406 and 407 updates will cause the Adobe Extensions Manager CS6 errors for ID and IC plugins.
On both a test system and my iMac installing the standard Adobe updater gets Adobe Extensions Manager CS6 to stop complaining about ID and IC plug-ins not being imported.
And Adobe, please decide if you want to call these extensions or plug-ins. Consistent language would be a bit helpful.