Order of installation:

1. Download IMPERIA mod pack.
2. Unrar MOD.rar folder and put all it’s containment into the root game Directory (do not copy the whole folder, but first open it and then copy all of the parts placed in it).
Answer “yes” every time you get asked “do You want to replace already existed file”;
This step will implant the MOD –1 (Baddog) into Your game. Do not try to launch this old MOD but be sure that its already in the system;

3. Take a file from the pack mods.gs2 and place it into the root game directory;

4. Launch the IMPERIA self installer – the file pimp0510f.exe
Be sure that installation is going directly into the root directory of BTW.
By default the self-installer creates a new folder called “Back To War” and sends the MOD into it.
And so check the path before installation and avoid the typical mistake:
Back To War/IMPERIA is a right path;
Back To War/ Back To War/ IMPERIA is a wrong path;

4.Take next files from the pack: dmcr.exe and mods03.gs1 and put them into the root game directory (Cossacks - Back To War)
Answer “yes” every time you get asked “do You want to replace already existed file”;

Now You can Play the IMPERIA.
Start like in the original game – by clicking dmcr.exe
In order to be able to see the intro clip install XviD viewer : XviD-1.1.0-30122005.exe
Note: You can play Imperia via Internet with only two players (now). LAN - as many as possible.
Full-scale patch for multi-play in Internet (Gamespy etc.) will come some later.

Enjoy!

http://www.internetwars.ru/Imperia/ImperiaEnglish.htm