It took a while, but the client linked is a fresh install patched up to 2.4.3 with nothing else modified except the realmlist. Enjoy and good luck!
1. Sign up for an account
http://tbc.nostalrius.org/
2. Download the client
Part 1
https://mega.nz/#!Gtg3lJBL!1leOAUCmtMcp ... 47UkH3gIYg
Part 2
https://mega.nz/#!j9hHDARB!AwG50tXPq1L3 ... tNkdvrNwAU
3. Launch the game
4. Input your newly created account name and password
5. Start testing!