Well, the good news is that I refused to give up and now I have the FlyByWire A320 back and in working order.
First, I zipped (7 zip) up the entire contents of the community folder onto the desktop. Then deleted the community folder and all of it’s contents. I fired up FS and rebuilt the rolling cache which automatically made a new community folder. Then I run the FBW installer, and HEY PRESTO! it worked/ I haven’t yet restored the rest of the contents - I’ll do that later, one at a time.
Have not yet been able to solve the fact that FS is still missing from the MS Store list of installed app’s - I guess that means that I won’t be able to install any updates now? A Google search reveals that there are indeed problems with the store app, but so far I am unable to find a solution.
I’m not doing anymore today. It’s been a long day, my butt is starting to tingle and there’s a big hole in my face wants feeding.
Many, many thanks to everyone for tips and suggestions
Glenn.