type in the search box and press enter to search packages on the web click list to see all installed packages select a version in the dropdown, and click install, to install that version click ...
I am having a similar problem. I have mmd_tools 2.10.2 installed and enabled. I download blender_mmd_uuunyaa_tools v1.7.2 from github. In blender I install the addon as usual, but it never shows up in ...