Extension Manager has no knowledge which extensions are CC2014 compatible or not, because it's impossible to embed a database in Extension Manager to record the compatibility information of ALL versions of ALL extensions. The authors of extensions declare the compatibility information via mxi file or manifest file within the extension package, and Extension Manager retrieves this information and installs them. The authors didn't anticipate that the Flash based extension support would be removed in PS CC 2014, so the extensions still declare they support the version higher than CC. As a result, Extension Manager installs these extensions for CC 2014 (copy all files to correct location), but PS CC 2014 will not load them. This is why EM lists them but you can't find them in PS CC 2014.
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