Getting the latest emoji (on my mac)

In previous years I’ve been a mac fan and upgraded regularly, but as the OS moves more and more towards iOS style with animations and offering little to a developer like myself, I’ve remained on OSX 10.10 Yosemite, whilst today it’s not even called OSX, it’s macOS Serria.However, my biggest daily gripe is that I don’t get to enjoy the latest emoji, and I’m often faced with tofu:
When text is rendered by a computer, sometimes characters are displayed as “tofu”. They are little boxes to indicate your device doesn’t have a font to display the text.
Finally, I have a fix