Had the same problem. It’s definitely one or more of the mods in the community folder. Have narrowed it down to an aircraft mod and a few liveries and am currently trying to figure out the culprit(s) by adding one mod at a time.
However, I recommend one thing: Each time you hit a snag and progress stops when starting MSFS. Remove the last mod(s) you added, and then rename the Community folder in order to start MSFS once more without any mods.
In my experience (and I have been doing this for the better part of 10 hours now) if you just remove the latest addition(s) that didn’t seem to work, MSFS still won’t start. Took me a while to figure that out. …
Best of luck and patience
BTW: the culprits in my case were a private mod I made for myself, and the USAF liveries for the C172 by BigGazza. There is an update available for the liveries that solves the problem!