I'm not very good in the subject of addons, and when I wanted to be able to add a polysphere on blender, I googled around and found an "Add_mesh_round_cube" addon which I believe should be correct. It's on the blender developer website, so I think it's quite a legitimate source:
When I selected the addon on the list (as seen above) I came to this page:
Apparently this is the python text of the addon. But I don't know how to proceed from here. Can anyone help me out?
Thanks for reading!