No, no issues there, thanks for the help though. I had found them a while back.
I got the 787 working just now by deleting and re-downloading it.
It’s another odd one, because I’ve never touched the default folders.
I’m about to do likewise for the other two airliners.
That, combined with emptying and turning off my cache (which got rid of the stutters and freezes), might be getting me back up and running again.
Finger’s crossed!