After posting my issue with DX9 not installing, I ran WOFF out of curiosity. Seemed to run with no problem up until I tried to go to the airfield. There I was told I had not verified CFS3 ownership and did a CTD.
Did a word search in the FAQ/Install document and found nothing other than: Note although you need Microsoft Combat Flight Sim 3 for licensing, you no longer physically need to insert CFS3’s CD, or to install it, for the install or running of WOFF UE
Please advise on how to complete this part of the installation.