I have already downloaded new aircraft into fsx by copying the downloaded file, and pasting it into the airplane file. I get to that after going throught the my computer folder, then local disk C, then program files, then Microsoft games, then Flight Simulator x, then sim objects...
I am wondering where I should paste new scenery, like the upgraded trees or water. Or do I have to do something totally different.
All types of scenery load differently.
Most have instructions in the read-me that comes with the download.
If it doesn't give us the link to it, someone will download it and let you know what to do.