Well, with some help from Alan, Tommy and others asking questions, I've now got V.5 installed and running - but with apparently 20% or so less A/C showing than normal, but could this be due to the lovely weather we're experiencing at the moment. It has taken several days, and multiple deletions and installs, but slowly getting there.
However, I still have one major problem, although I've gone through the updating Database process, I've still only got 80317 A/C loading in the D/B - any suggestions please.................