1) Download the Mod here: http://files.filefront.com/Phalanx+M.../fileinfo.html
2) Unpack it with WinRAR
Spoiler Alert, click show to read: 

3) Copy the freshly unpacked EB folder into the folder you have installed EB into (for exampel "C:\ProgramFiles\The Creative Assembly\Rome - Total War")
Spoiler Alert, click show to read: 

4) Overwrite the existing files
5) Play EB with TWFanatics Phalanx mod

BTW: Have you installed the EBTrivialScript? If you have there should be no problem.

At TWFanatic: I hope you are not angry with me, because I answered a question which was for you.

Ceterum censeo Romam esse delendam