Thanks Crunchmeister71 and others who have replied Your 3 options are the only ones I’ve also found. Boxed set is out for me No CD ROM) - MS Store , ONLY CD ROM delivery. Steam looks like the only option that I have left, sad 
I’m a disabled vet and really wanted to get back into flying again after my old puter crashed (8 Years old)
Guess it’s now up to me …
Thanks agin to ALL
Mitch 1/35Inf 4thDiv.