As I've said in my previous message, it seems GSX is not installed, that's why I've asked you to try installing using the full installer again.
If reinstalling it doesn't fix it, there's no other choice than enabling logging, as I've explained in my last message. The FSX\fsdreamteam\couatl folder is a folder named fsdreamteam\Couatl under your FSX folder, which is usually C:\Program Files\Microsoft Games\Microsoft Flight Simulator X, if you installed it in the default location.
Reinstalling doesn't have anything to do with registration/activation, the only way to lose it and have to insert your Serial Number again, is only if you reinstall Windows from scratch, or change a major hardware component.