Information, download links and support for the Rome: Total War version of Citadel: Total war can be found on the CTW forum under the hosted mods forums for RTW.

https://forums.totalwar.org/vb/forumdisplay.php?f=87

While the focus of CTW will now be shifting towards the M2TW version, we hope to release a content pack which will add the rest of our completed units and artwork for the RTW version as a patch some point in the near future. And until we are able to play with M2TWs models and textures, the RTW version is the only place you will be able to see what many of the units are meant to look like.