Thanks Jan, I will follow your advice - in those early days, there was a lot of community stuff but hardly anyone was providing a readme and those few developers who did were giving giving different advice. So I had to assess the quality of the developer, and make a best guess as to where things should be. That has worked up until now.
The ORBX stuff I installed created a folder called 'Aerofly FS 2 Flight Simulator AddOns. I will copy the missing DLCs into there
Thank you to Admin and Mike I have now set up a new folder similar to your ORBX one Mike. Back to the computer. Kindest regards, Michael.