Umberto, I am sorry, but I do not understand your instructions to "configure the Antivirus cfg" (mine is the default MS Defender) so that i will not scan the Addon Manager. Furthermore I have the FSX Version and not P3Dv4 therefore this reference does not apply.
Anyhow, I think the best is to start from scratch. Therefore I have uninstalled all fsdt sceneries, the addon Manager as well as the QW B757 which is connected to it.
Now, in the meantime, as a test, I have started to reinstall LSZH by disabling the antivirus but have seen that the buildings still not visible and the Addon Manager is still not shown in the menu, even it is installed automatically.
So please inform me how to install fsdt sceneries from beginning as if I would be a new customer who has bought Hawaii1+2/PHNL/LSGG/LSZH.
Thanks for your support.
Alfred