The author didn't allow the embedding of the font, so you won't be able to do so

It says clearly it is a demo for personal use (on your own computer) only so it is not strange that the author has set the embedding rights on Restricted License embedding. What you want to do is exactly what the author tells you not to do with his mutilated Helvetica Black.
Thank you for replying, yes I realised soon after that there was document explaining it... sorry for being thick!!
Fuso orario: CEST. Ora sono le 12:49