TheSwanMod 1.0(not available, 2.0 will come out soon) file

stepA- MAKE SURE ITS CLEAN FROM OTHER MODS(pure vanilla 1.51 from steam), then move\copy\drag the "europa_270bc" and "data" folders from "TheSwanMod" folder to your vanilla folder of RTW1, and over write the data folder, it will combine itself(make a backup for your vanilla RTW1 data folder before merging).

stepB1- make a copy(shortcut*) of RomeTW.exe and put it on your Desktop, name it what ever you want i recommend TheSwanMod.

stepB2- then right click on that copy on your Desktop and click on "Propeties" in this box, click in very right end of the box named Target, now add in a space and then the following text: -mod:europa_270bc -show_err
it should look like this:
"C:\Program Files (x86)\Steam\steamapps\common\Rome Total War Gold\RomeTW.exe" -mod:europa_270bc -show_err

now click on Apply and you are good to lunch the mod!
lunch it via the shortcut you made.