How can I install sextante (and where can I download it) if the Plugin Installer doesn't works?
As I work for a corporation, I have some problems conecting to the official repository, and I cannot solve them ...
You can download the most recent version of the SEXTANTE plugin here.
To install any plugins offline, you simply need to extract the downloaded archive to a folder and copy the extracted folder to the
~/.qgis/python/plugins/ folder. The
.qgis folder can be found inside the private document ("my documents") folder of your user on windows
Then start QGIS, open the plugin configuration dialog and activate the SEXTANTE plugin.