Hmm can you check the logs? maybe there some hints, there might be also issue with 3rd party dlls if that plugin use any. you mgiht try rebuilding engine and see if plugin actually builds.
There also other option, make C++ project, move plugin to project directory (yes you can do that), put Plugins/Marketplace inside project directory (if it does not work move plugin out of Marketplace directory to Plugins, refresh VS project files of oyur project and then rebuild, this will make plugin part of the project and allow you to focus on that plugin. If it will work you can move bineries to engine direcotry, they should work