The ETF21.zip file you have requested: Modifications / Empire Total Factions / Empire Total Factions - 407.55mb is not available. Perhaps try browsing all files for the game Empire: Total War and upload any files you want to share or are missing. This is the only information we could locate:
ETF is a combination of several startpos mods of mine that make playable all factions in the Early (normal), Late and Warpath campaigns. With ETF you can play as any faction with a couple of clicks, without replacing, copying or deleting any files. Download ETF21.zip, unzip it, run ETF21.exe and install the mod following the on screen instructions. Make sure that you install the mod in your game's directory which by default is C:\Program Files (x86)\Steam\steamapps\common\empire total war. If you have installed the game in a different path, redirect the installer when the installation path screen appears, browsing your path.
Always start Steam manually and then start ETF using the desktop shortcut. Select your campaign and play. No command is needed to be added in user.empire_script.txt.
You can uninstall the mod using add\remove programs in windows. If you accepted it during installation, there will be a folder created in the Start Menu, named Empire Total Factions containing a uninstall link. Uninstall exe can be found in game's directory (...\empire total war\).