Thanks for your help and I do understand the restrictions
I seem to have done what has been offered, but maybe not in the correct order, over the weekend, but nothing has worked, well it has, all is installed as Plug ins and DRM protected books are within Calibre, but not working - incidentally at that point the process brought 2 books in with each one book add on, but I feel that might be a 2nd book in another format.
Anyway, when I have a few hours to re-do all this stuff, I will start over and try to process in the right order.
Before that, however, I am going to take a look through the Calibre manual, as it may be easier if I actually understand what I am doing, I might then have half a chance!!
Again many thanks