I managed to solve this problem for me.
To keep this short, I end up in a situation where the sim would CTD when it reached the final screen where you had the option to select Accessibility Options or Start…
After trying various things, the actual resolution was to delete my profile data from the cloud. IMPORTANT: this does delete any progress you have made like flight hours and removes any controller configs you created. I actually went through a few other steps as well, which personally I think are worth the extra effort. In my opinion I think the CTD’s I was experiencing were being caused by a corrupt/messed up profile stored on the cloud.
This is somewhat of a nuclear route to take, but I figured if the outcome was favourable and the CTD’s stopped it was worth doing, and quite frankly as the sim was so flaky for me I had not really achieved anything anyway!
I am on Windows 10, so this may be different for you may need to search (Google) equivalents to the below in some cases. The below is the way I would suggest you tackle this. Please follow this at your own risk and be aware I cannot guarantee it will work for you… but you probably do not have much to lose. I will post the guide separately…