Some people are having trouble installing the mappack. After you download MTW_VI_MP_MapPackVol1.exe, you run it, and it finds your mtw/vi game folder using a registry key. However, if you don't have this key or if you have multiple installs of mtw and vi, the installer could default to the wrong folder and the maps will then install to the wrong place. The correct folder for your game is the path shown in the properties of the shortcut you use to start the game. Right click the shortcut and look at the "Start in:" line. If the mappack installer is showing a path different from that, you can copy and paste the correct path, without the quotes, into the installer on the line indicating the install directory. Alternately, you can navigate to your main mtw/vi folder using the ... button to the right of that line, and choose the install directory that way.
Note: For players who want as clean a map folder as possible, get the OriginalVI_Maps as well from the same place, delete all the maps in your \battle\maps folder and install both the MapPackVol1 and the OriginalVI maps.
These are the links to the individual mappacks:
MapPackVolume1
OriginalMaps
Bookmarks