Thanks for your explanations, but notice that I have uninstalled from the Windows 10 Application Managed and then, reinstalled in the default folder, with the exe I got on SimMarket an obviously, what you describe DO NOT OCCURED, So your system has obviously some problems.
What "did not occured" ? No Symbolic link has been created using the installer, so you only have files in the FSDT Addon Manager\MSFS folder, but nothing in the Community folder ?
That's not normal, and I'm fairly sure the link in the Community folder IS created. If it wasn't, nobody would be able to see the scenery and, we would have thousands or reports here.
We initially ( when MSFS came out ) had some reports with users installing MSFS with an account and installing FSDT with another account, and this in fact prevented the installer to detect the Community folder. But in this case, the installer wouldn't proceed, saying MSFS couldn't be found.
Also, note that, to really say that no link is created, you must start with no Zurich folder ( linked or real ) in the Community folder. Because, if you have a real copy you made yourself, it won't be "transformed" into a Symbolic link.
Moreover, how can I guess you are using symbolic link ? What is this symbolic link ? A file ? If yes, which name it has and is it supposed to be located in folder "Packages\Community" ?
It looks like a folder, but it has a small arrow which indicates is not a normal folder, but a link. If you enter it, it will show all files, AS IF they were there, but in fact they aren't, what you are really seeing, are the files that are linked to it, in the original folder ( the Addon Manager\MSFS folder ).
It's really a common practice, it's not something strange or unusual we do ( Orbx uses the same method ) and, in fact, is so much better than just copying the files in the Community folder, that 3rd party utilities like the Addon Linker has been made to CONVERT existing sceneries to use Symbolic links instead of actual folders.
And if I change the location of my "Packages" directory, didn't I need, in this case, to redo this link ?
No, you only need to take back the link with you! That's the point. The link will always point to the folder it was linked to when it was created so, if you copy the link when you moved the Community folder, it will STILL point to the same place, which is how's supposed to be.
What is also very strange is that I didn't remember AT ALL, to have moved your addon manually.
You surely must have, if what you reported is true, that no Symbolic link has created by the installer.
If this really happened, the only chance for you to see the scenery, was to manually copy the actual package in the Community so, I guess that when you originally installed Zurich, you didn't see the scenery ( no chance to see it without a Symbolic link to the Community ), so you copied the whole scenery manually, that's the only possible reason why you had a "real" copy of the files which couldn't be updated, instead of a linked copy that WILL be updated.