Clients:

1.12.1 (Vanilla):
drive.google.com/folderview?id=0ByPTNLduvdC2NzZCLWtNNVZoQ3M
http://thepiratebay.se/torrent/5076223/World_of_Warcraft_Client_-_Version_1.12.1_enUS_-_Windows

2.4.3 (TBC):
magnet:?xt=urn:btih:d9e48b11dc47dd46e40c28521008c8843222bb25&dn=World+of+Warcraft+-+2.4.3+TBC+Ready.&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80&tr=udp%3A%2F%2Ftracker.ccc.de%3A80

3.3.5a (WotLK):
magnet:?xt=urn:btih:dd31c5ce1984b183e310196306cb958a4b08243f&dn=World+of+Warcraft%3A+Wrath+of+The+Lich+King+%28WOTLK+3.3.5a%29&tr=udp%3A%2F%2Fopen.demonii.com%3A1337&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Fexodus.desync.com%3A6969

4.3.5 (Cataclysm):
magnet:?xt=urn:btih:14db517973db57814e78a131c6cd7064d15c3bb9&dn=WoW_Cata.zip&tr=http%3a%2f%2ftorrent.twinstar.cz%2fanounce