Create a folder named for example 'MSFS-Contents' in your C: drive or other drive. For example C:\MSFS-Contents\ it's important that the path must be short.
Then, just cut and paste the folders Community and Official from C:\Users\Timon\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\ in C:\MSFS-Contents\ and launch the game. On checking for updates, as it can’t locate the current files, it will let you select the new location to the folder, give it C:\MSFS-Contents\
Try to reinstall the A330-900, now installation should work because the path to Community folder is shorter than the limit of characters.
Note that I didn't try this method by myself, I have only read on other forums this is the way to move the Community folder.