There are two types of units: from the beginnig of XVIII century and Seven Years' War.
You can play only custom battle in beta version. We haven't finished historical battles yet.
I'm announcing next European Wars version on the end of August.
New version will include intro-movie and 4 new factions: France, Great Britain, Danemark and Norway, Portugal.
INSTALLATION GUIDE:
-install Rome Total War ver. 1.5
-download EW from link
-unpack (WinRar or Winzip) and install to: C:\...\Rome Total War
-run mod using shortcut: EW- Total War