In addition to that, if you use FS9, you should pay attention to this on the FS9 Products page:
https://fsdreamteam.com/products_fs9.htmlBecause of Esellerate closure and our switch to a new ecommerce provider ( QLM/Soraco ), you MUST update the Addon Manager for FS9 using the Stand-alone installer there, and you MUST do it as the LAST thing you do: first install all sceneries, then update the Stand-Alone Addon Manager for FS9, then activate what needs to be activated.
If you don't do it in this order, installing a scenery after the Addon Manager will downgrade it to an older version (the scenery installers hasn't been updated) that doesn't support QLM, so activation won't work anymore. That's why the Stand-Alone Addon Manager for FS9 must the installed AFTER all sceneries, as the last thing you do.