Here is the latest mmd_tools_helper 2.6. Includes a version for Blender 2.93.1 .
If you want to do a mass renaming of bones to a bonemap which is not part of mmd_tools_helper, here is an example Blender python script which you can re-edit according to your needs:
You run your bones-renaming script from the Blender text editor, the armature selected to be the active object.
To download a file from deviantart sta.sh:
When you are logged into deviantart, open your main sta.sh page (Just type sta.sh into your browser address bar and press enter). Then load or reload the sta.sh page of the file that you want to download.