Hi Alex,
Rather than chat with M/soft I followed your advise and Apple's and created a new user account on the Imac.
The MAU 4.16 is downloading and updating office successfully. I will have to wait for next months updates to see if automated mode works.
This link is the steps to rename your current account - I wanted the new account to have my name , so I renamed mine to have 'Old' at the start eg OldSteve. Make sure you do account
name, display name and user directory
https://support.apple.com/hr-hr/HT201548
Then to 'duplicate' the user OldSteve to Steve do the following steps - this will migrate all the data including photos, music etc from OldSteve to Steve.
http://danfrakes.com/2015/01/04/how-to-duplicate-an-os-x-user-account/
Many thanks to DanFrakes.com for this guide.
Afterwards I had a small issue. The favourites in Finder for Documents and Desktop needed removing and re-adding - very easy.
NB I have only just done this, so I am keeping the 'OldSteve' account for a week or so. If I find other issues I will post them. So far everything seems to be fine after using the
migration tool.
Cheers
Steve