ValueError: bpy.app.translations.register: translations message cache already contains some data for addon 'mmd_tools'

[supahfox]

Trying to install mmd tools from branch blender-v4, it returns this

[Yusarina]

Personally I would not be using MMD tools on Blender 4.0, as the developer as stated in other issues, there don't plan on releasing it unto the LTS for 4.2 comes out.

see this for more info, key word is it's under development.

There for this means the blender-v4 branch is not stable and may not be unto later this year.

[UuuNyaa]

Please try MMD Tools v4.x and give us feedback.