Yes, you can use in your projects, it is free. You are only forbidden to modify it and resell it in source form, please check the license file attached into .
As for copying without breaking you can refer to video, with a step-by-step. Just know that is a C++ plugin & Blueprint asset, so you will need Microsoft Visual Studio installed to make things easier. The video:
watch?v=1W6Z5XnUyAI