Missing subscript and superscript command

[Remark25]

Why are the subscript and superscript commands missing in all commands tab in the customize ribbon window (see attached file)? I am using excel 2016. I don't get it.
Thanks for any response.

Vojta

[#2]

Looks like it is version dependent. See https://panuworld.net/utils/excel/index.htm. They say that version 2017 is required.