Checked everything but - what a surprise - LSZH V2 comes without any buildings. The couatle-programm is at the Addon-Window and at the Addon Manager Zurich is active. What is still wrong, Umberto?
If you manually replaced that Zurich.pye file that was posted here BEFORE Zurich V2 was released, you don't have to use it anymore, it works only for V1, and it will not show buildings in V2.
Remove the FSX\fsdreamteam\Couatl\ZurichX folder, and reinstall Zurich V2.
The issue is, Uninstallers will not remove something they did not put there. So, if you put it manually before Zurich V2, you have to remove it manually.
Uninstalling Zurich V2 by replying YES to the question "Do you want to remove the Couatl engine?", will obtain the same effect, because in *that* case, the uninstaller will force-remove anything, allowing a full from scratch reinstallation.