excuse me but can this mod work on Rome total war alexander ??
Not sure, sorry can't be more helpfull.
Just tried to download the mod and two patches using the links in the OP.
The two patches from mediafire downloaded fine but the RNJ-2.rar from the mortoncarnie site appears to be missing.
If you mean the installation note- I got a little confused as well.
For " Target - "C:\Program Files\Activision\Rome - Total War\RomeTW-BI.exe" -mod:bi\shogun2 -show_err -nm -ne -enable_editor ", you need to go to your Barbarian invasion shortcut on your desktop, and right-click to go to "properties". Once your'e brought to the properties window, you'll see a line that says "TARGET"; that's where you copy the line above to. Then you can launch the game and it'll be RNJ.