Because there are some issues still with the installer, I have made a temporary upload of the mod's .BIG file. Here you go.
Place TPW.big in "My Battle for Middle-earth II Files".2)
Create a second shortcut from your original BFMEII desktop shortcut.3)
Right-click the new shortcut, go to the Properties tab, at the Target field, add " -mod TPW.big". For example, this is mine: "C:\Program Files\Electronic Arts\The Battle for Middle-earth II\lotrbfme2.exe" -mod TPW.big
This should work fine until Lauri fixes the installer. When he does, I suggest deleting TPW.big and your shortcut and download the installer.