Thanks mate....I did some Googling and many others had the same problem, but solutions seemed a bit complicated.......for me anyway.
Anyway, I decided to do it my way and found that deleting the FakeMSI file whilst the game is installing caused no problems.
The game installed just fine and I let Relic download and install all the updates.
It was a bit disconcerting to watch the game being installed, and once finished it completely disappeared from view.
Thanks for taking the time to post a replly.