Installation

linux :
if you are not comfortable with linux, or because installing bender 2.49b on ubuntu 11.10 is not that easy, you can check:
http://jerome.le.chat.free.fr/index.php/en/blender/tutorials/blender-and-ubuntu-1110.html

once you have downloaded the last release of Blended Cities, unzip the folder anywhere you want. (for example unzip it using 7zip http://www.7-zip.org/ , a swiss but open-source army knife for any kind of archive)
it is not recommended to locate the BlendedCities folder in the Blender folder, like in .blender/script, because the BC folder contains also a library of urban objects that should not reside here.

move the blended_cities_24hook.py file from the Blended Cities folder into the Blender script folder (.blender/scripts) :

(with ubuntu, the .blender folder is hidden : type ctrl H in the Nautilus window to display it)

http://jerome.le.chat.free.fr