For installing Orbx sceneries you need latest FTXCentral:
https://orbxdirect.com/ftxcentralOrbx sceneries will automatically be installed inside P3D v4 main folder and automatically registered in the scenery.cfg.
Other sceneries: this depends if there is an installer or not and also depends on the installer itself. Some installers don't allow to change the installing path.
In V4 (already in V3) you don't need to install other sceneries like RTMM inside the main folder.
An excellent tool for regístering sceneries in the library is the "Lorby Tool":
- addonorganizer
https://lorby-si.weebly.com/downloads.html (scroll down a bit)
For registering sceneries I don't recommend the .xml method although it's recommended by LM.
All Orbx sceneries are registered in the "old" way in the scenery library.
If you register RTMM sceneries with xml method in
C:\User/Name/Documents/Prepar3D v4 Add-ons
FTXCentral will not recognize these ones and you cannot set the insertion points correctly.
Another important tool for handling Prepar3D v4 files like .xml or cfg is a suitable editor.
Old windows notepads are outdated and only use ANSI code. These P3Dv4 files need special encodings
like UTF-8 or UCS-2 Little Indian.
Recommended is freeware "notepad++"
https://notepad-plus-plus.org/
