Tuning setting doesn't can't be applied

[edmundssteven]

I'm trying to use this plugin with Musescore version 3.3.4.24412, and macOS Catalina 10.15.1. I may just not be using it right, but it doesn't seem to work for me. If I open the Tuning plugin's window without selecting any part of the score, then select a different tuning, and then click the Apply button, it tells me "No selection. This plugin requires a current selection to run". If I do have notes selected, then the Apply button just closes the Tuning window, and the tuning doesn't get applied to the selection. If I open back up the Tuning window, the Temperment setting is back to "Equal".