Here are clear instructions.
Step one:
Follow this link.
http://www.twcenter.net/forums/showt...ated-08-11-13)
Download the file. What you are downloading is Mitch's mod manager. This enables you to manage your mods which you have gotten without the use of the steam workshop. Once you have downloaded it, move it to your desktop or wherever, and open it up. You can follow the instructions given on the page I linked you to find out more about it.
Step Two
Follow this link.
http://www.mediafire.com/download/n8...e_et_Impera.7z
That is the mod itself and you will need to download it. Then open the folder and extract the .pack file. Move it onto your desktop. the .pack file should just look like a white square.
Once you have done that go to this directory;
My Computer/Local Disk C/Program Files (x86)/Steam/steamapps/common/Total War Rome II/data
Then drag the .pack file from your desktop and put it into your data folder.
Step Three:
Once you have done that, open up Mitch's mod manager which you will already have downloaded. You will see that divide et impera has appeared on the mod manager list. make sure it is ticked. then hit launch. then your steam launcher will open and just hit play. Then you are done.
This is the same way you manually install pretty much all Rome II total war mods.
Hope this helps.