New Mac user friend bought Office for Mac 2016 Home & Student edition in the form of a card with installation/download instructions & a 25-character code to be entered in the relevant filed while logged into their Microsoft account.
Followed said instructions: was told the 25 character code didn't match any products & to follow one hyperlink if the software to be downloaded was Office 2007, 2010 or 2011 for Mac & another link if dealing with Office 365. No mention at all of Office 2-16 for Mac.
So we followed up the 2nd option of going through office support website.
The page opened, recognised the product concerned as Office for Mac 2016 & showed a download button. Too many mis-steps & hoops to jump through. In the end, though, the suite got installed.