You will need the alpha 0.1a full install, avalaible here(copy one of the following links in your browser):

http://www.clanwars.cz/
http://www.quakewars-fr.com/
http://www.tront.co.uk/
http://planetquake.gamespy.com/
http://www.clandooc.de/
http://wolfenstein-city.4players.de/
http://team-explanation.com/moddb.com
http://wowar.salteh.net/
http://www.strategyinformer.com/

And the 0.1b patch (required):

http://www.etqw.fi/
http://ettw.net/
http://gangs4life.foolishgames.net/
http://wowar.salteh.net/
http://www.per-thormann.de/
http://www.svofzo.nl/

Unzip the files in your /Enemy Territory:Quake Wars/ directory.

You can also add a direct shortcut to WoWar:
_create a ETQW shortcut
_rightclick, properties
_add "+set com_usebinarydecls 2 +set fs_game wheelsofwar +set g_usecompiledscript 1 +set si_pure 1" after the path of your shortcut, without the " ".

Have fun! (remember it s an alpha, so it's not finished yet, and you may encounter bugs)