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):
bitbucket.org/Malaco/cataclient/downloads/AT%20wotlk%203.3.5a%20Windows.torrent
http://thepiratebay.se/torrent/6163279/World_of_Warcraft__Wrath_of_the_Lich_King_3.3.5a_%2812340%29