Try this:
- Remove ALL mods from your community folder.
- Launch the sim.
- Once loaded to the menu, exit the sim.
- Run the FBW installer to install whichever version you want, then launch the sim again.
If it works, then either you had a previous/discontinued version of the FBW A320 sitting in your Community folder, OR you had another mod in your Community folder that was conflicting with it… in which case, you’d need to add them back in one at a time to reveal the one causing the issue.