"How do I install it in the Steam version?
In order to install it in the Steam version, you need to set the installation path at install time to the directory where the AoE3 Steam version is located, which is usually Program Files\Steam\SteamApps\common\Age of Empires III\bin.
Additionally, you can make a copy of your AoE3 installation and install and run Wars of Liberty on this copy, without having to rename folders or change registry back and forth."
----- by making a copy is that the same as copying the whole directory, installing WOL, then pasting it into the directory again? can u decide which executable to use? or how does the installation work?