No these were just TTF files in an ordinary folder. Any way they are installed now.

Cliff. I had tried this as well. Very strange. I tried both methods again on a number of fonts; nothing happened and then I tried another and it started to install them. Something unblocked. Anyway...

I can find the install button but when I click nothing happens. I have also tried the Drag & Drop method ie dragging the font over the font folder. Both cases no result. I assume that any ttf file...