If you already have RVC installed, then just download GUI.py and drop it in the root folder! If you need to install RVC, I recommend you check the original repo Or read this at least.

I recommend you use a virtual environment

If you're on Windows, like me, and don't have an NVIDA graphics card, install the requirements from a different .txt:

Also, do not forget to download the necessary models. EasyGUI uses RVC 2 40k models.