You don't say which simulator you use but, assuming you use FSX, it seems if the sceneries were moved in the Addon Manager, it seems you must have a *VERY* old installation, one made when our products installed "into" the simulator main folder automatically, which we don't do anymore since years.
This process usually works but, depending on your sim configuration, it might not always work. I suggest doing this:
- Uninstall ALL your FSDT products, sceneries and GSX. Reply to the question "Do you want to remove the "Addon Manager ?" that is made a the end.
- DOWNLOAD all the latest installers for all the sceneries. You seems to have the latest installer from GSX so, if you do, you can use that.
- Reinstall them in the default suggested folder, or any other folder you like, but NOT choose the simulator own folder.