Since you’re on 2.853, it would perhaps be better for you to try the mpd update first to get rid of the playback cut-off problem (yes, just follow the instructions there). 3.010 has its share of issues and while the plugin works well without needing to update mpd, you may encounter other issues.
As @dvo said, you need to run volumio plugin install after cloning the Github repo. You can just go to the Github link and copy and paste the commands from the installation instructions (after enabling ssh on your Volumio device).
I suggest we all move to the new thread and raise questions about the new plugin there. This way, the post with the new plugin link will not get buried by the later posts.