I have found a client of the EU Open Beta Client with WoW version 1.1.2!
The website is unfortinatly in German, but they are just called like "Part 01"
The links are:
Spiele - Rollenspiele - World of Warcraft - GIGA.DE
Spiele - Rollenspiele - World of Warcraft - GIGA.DE
Download all 9 parts and run the installer. It will extract it self and make an WoW Installer!
*EDIT*
login with..
username: harkbot
password: h4rkening
(top left of the page)