As one can see from the partial screen shot above, my admin menu is missing the Header Tags item.
The catalog section of the contribution was installed correctly because its home page's title is "Home Page". So I must have made an error when installing the admin part. Where did I go wrong?
My catalog is only days old and this is the first contribution I have attempted installing. Prior to attempting that install, I had made a few minor changes, all of which I can't recall but one was to do with changing the title of the home page.
The Install_Catalog.txt file states in part:
Well, from what I stated above, I didn't think my catalog could not really have been considered to be clean (even though the Header Tags Controller contribution would have been my first one). So, just to be on the safe side, instead of copying the files from the "catalog_for_new_shop_only" folder, I took the longer route.
Unfortunately, this seems not to have worked.