After the release of Sim Update 7 (GOTY edition) if you own FSDT Zurich, you should delete the Microsoft Zurich from the Content Manager to prevent conflicts with FSDT Zurich. It must be deleted from the Content Manager, with the Delete button there.
If you use any other method, like manually removing its folder, you'll be presented with a mandatory option to redownload it on the next restart so, you must remove it from the Content Manager.
This if you are on PC.
If you are on Xbox, there's a big problem because the Delete button is unavailable on Xbox for any content that is part of the "standard" package. You can Delete Premium/World Update packages from the Xbox, but not standard packages and Zurich has been flagged to be part of the standard package instead of a World Update, as it was with all handcrafted airports that has been added with updates so far. So, until Microsoft fixes that, there's no solution on Xbox, and you are prevented to use what you paid for.
I suggest to all Xbox users to voice you complains to Microsoft, because this problem will prevent anyone in the future to make a new version of an handcrafted airport that already exists in the standard package.
