How to use it in 5.7?
Copy the 5.6 version of the plugin to YourProject\Plugins as you’d normally do. But it has to be be a C++ project and have visual studio installed. It will probably warn about the plugin version but still ask to compile.
And that’s it. (If it warns you about the plugin version everytime you start the project, you can open up the plugin’s uproject in a text editor and change the engine version to 5.7)