Hi Vladimir. I have the same problem. Plugin is not appearing. What I found is that CSS and JS assets are not getting loaded. I tried on 2 different servers /local XAMPP and remote Apache/, but what both installations have in common is that both are in subfolders. I checked console and what is missing in assets path is folder name. Example : localhost/test/ is url to webpage. Plugin is looking for css and js in path localhost/plugins/pkurg/... .So subfolder is missing.
I have bit different problem because I can override these paths in plugin to make it appered. My problem is GrapesJs storage /images .... /. I will open new thread for this.