I appreciate your post, as it intended to help other people. The thing is though that the information is wrong, or at least incomplete.
After one has copied the 2020 folder one has to delete its content. That’s the main point.
Here’s a very detailed instruction.
One sunday and monday i could get into the Sim. But since yesrerday evening im also stuckk at 97%
Im on Xbox series X
They’ve been enabling more of our markeplace purchases this week and unfortunately they’ve not been doing a very good job of testing that they don’t hang the sim, so some addons they enable break everything. Unfortunately on xbox you are stuck, and as far as we know the game will be broken until MS removes the bad addons or Asobo fixes their code.
I don’t see a commiunity folder in the C:\XboxGames\Microsoft Flight Simulator 2024\Content folder.
Are you talking about this foldfer system that wes established by my Steam when I was running Flight Sim using Steam?
C:\Users\RFDur\AppData\Roaming\Microsoft Flight Simulator\Packages
Had that too yesterday on PC. 
Same for me. Also XBox X.
I got in touch with support on this one and the solution from them which worked for me and allowed me in was to “delete my cloud saves” as described on the web at:
Microsoft says MSFS2024 is developed to fully optimize gameplay on the Xbox.
But it’s not working good for Xbox and also not for PC users, what is happend?
Did the designers take the wrong turn or was the pressure too high to release the sim in its current state before the end of the year. 
Im stuck at 97% since yesterday on PC (Steam).
Might this be due to some Marketplace AddOns?
I only bought 4 AddOns in Marketplace (luckily, and it was at the VERY beginning of MSFS).
EDIT: fixed, had to disable the newly added Marketplace AddOnse. Great testing MS!!! 
Have the problem being stuck during loading (XBox X) with both FS2024 and FS2020 already since yesterday.
Same here, yet no word from Microsoft on this particular matter.
Which one was the problem for you? Since you only have 4 it should be easy to figure out.
Finally some positive news on this one!
Summary:
I think it’s pretty clear these options should have been in place before the game was ever released, and it all shows how much of a rush job it was. But at least there’s now light at the end of the tunnel, at least on this problem we should be in a good place soon.
hard to say… it could be but you find tons of ppl wo could fix the 97% issue by a simple restart, other by flushing dns and again others like you probably.
I dont want to doubt it but ive seen various solutions by now^^
No, there’s no doubt that incompatible addons are a major cause of permanent stuck at 97% loading, even Asobo have acknowledged this and communicated a plan to deal with it.
For sure there can be other things too, but broken packages is a major cause.
IMO that took them about 6 days too long to figure out.
Here is my opinion.
I deleted my profile from “everywhere” from MSFS24 (under manage).
Restarted and the game launched.
Once in the game, I picked a A320 Brocard I think, and tried set up a flight.
When I clicked “Fly now” it just sat there for 20 mins.
I rebooted and then got the 98% loading screen again.
I am guessing it was try to load that plane.
Deleted my profile again, and the game launched with a default aircraft of course.
Seems maybe some of the planes we used in 2020 are not compatible.
Hope it helps someone out there.
Jorg says, problem solved!
Why are you so stubborn? 
Different reasons for it, different solutions for it.
Makes it harder to find a solution for eachs problem.
Restarts, empty community, clearing cache etc. didnt help, for me it was one of the forced AddOns.
