1) You need LOTR-TW Open Beta v2.0 already installed (Mod for Alexander TW, expansion of Rome TW).
2) Install "LOTRTW_v2.0b_OB" in the main RTW folder where RomeTW-ALX.exe is placed.
You do not need to follow the other instructions included in this 2.0 version (shortcut, video intro, etc), the patch 3.0 will do it automatically.
3) Install this patch "LOTRTW_PATCH_v2.0_to_v3.0.exe" in the same folder where RomeTW-ALX.exe is placed.
It will copy one file into main Data folder, but it will not overwrite any original file.
4) A shortcut with the name "Lord of The Rings - Total War" will be created in your Desktop, to launch the mod.
You may also use the file "lotr-tw launcher.bat" placed in the main RTW folder. Or to create your own shortcut.