Hi Napoli23, just follow this steps and everything should work fine:
1.Place all 12zip files in some new folder
2.After that right click on the first one (it should have number 001 at the end of the name) and choose extract here, you need to have
7zip to do this, if you dont have, download and install it, its free.
3. After extraction, you will now have new folder named "Bellum crucis 7 setup", inside should be two bin. files and one exe file (installer) on top. Run installer.
4. The installer should find the original path but if not, remember to install it in
mods folder for example E:\Medieval2TotalWar\mods\BellumCrucis7.
Hope it works now