Alright, friend actually got it working by using @Silcore's method, that being
Download the EpsilonWoW_Mac.zip
Unzip
Put the .app into the Applications folder.
Put the .app into a folder called "Epsilon" inside of the applications folder.
Open the .app
You will encounter an issue asking you to delete the file. This is because the file is from an unidentified developer. See the instructions in the OP for which terminal command you need to use to fix this.
Once the .app opens, wait 5 minutes for it to install the core files to start the game. It will appear frozen, but it isn't. Just wait.
Once the game loads to the start screen, exit the game.
Now grab the necessary tc_bundle.txt file and put it into the Epsilon folder you created. Also go into your WTF/config.wtf file (open with Notepad) and change the line SET portal "enUS" to SET portal "play.epsilonwow.net".
Open the game again, log in with your account information (ACCOUNTNAME@epsilonwow.net).