Hi Yasei,
It’s not clear what you mean by “cannot be used”. You need to extract the archive content to MyProject/Plugins/ (MyProject being a C++ project) so that the .uplugin is inside that folder. Upon launch UE4 will ask you to compile the project. Please note that the plugin must be compiled in order to be used. Maybe that is your problem. If your project is not a C++ project it would be theoretically enough to add an empty C++ class to your project and let UE4 do the rest. In any case for c++ UE4 project on Windows Visual Studio 2015 is required.
Feel free to report any problems!