To install from scratch on a computer with Lion or if you just want to use a torrent, download the PC client via a torrenting client. One such client is Transmission . Download the torrent tracker for the PC game files here for WOTLKor here for Cata. Once you have successfully download the files, drag the folder to your applications folder, then drag the .app file for your version from here (WOTLK or Cata):
http://www.mediafire.com/download/y4../App_Files.zip

Anyone having problems with OSX Lion and graphics glitches/anomalies add this line to your config.wtf under the wtf folder, this has completely gotten rid of any issues with the mac version for me.
SET gxApi 'GLL'

After you download the sparse image file, double click it to mount it. When you look in the mounted disk, you will see a wow icon. Click and drag that icon to your wow installation folder in applications. This will be the icon you click on to play wow with. Disregard all of the .exe's, it works fine. Enjoy!

First of all, you will need the WOTLK client. This file has a downloader for all WOW clients - make sure you select 'Wrath of the Lich King'. (Don't let it patch though - see below)
World of Warcraft Full Mac Install Client - Big Download
Once the installation is complete, the launcher will attempt to patch. You MUST abort this patch, as 4.x.x is not supported on Warmane. For future reference, always start WoW with the World of Warcraft.app file.
Next, you will need to patch your client to 3.3.5a. Download and install the following patches, in order of posting (you only need one of each patch, multiple mirrors are listed).
If a link is broken, you can find alternate mirrors here or here.
All you need to do is run the updater file included with the patch. If it will not run, see notes at the end of this guide. After each patch is completed, DO NOT let the auto update patch to 4.0 - abort it immediately.
3.2.0
Macgamefiles.com: World of Warcraft (Universal Patch)
The Patches Scrolls - Patches
3.2.0a
Macgamefiles.com: World of Warcraft
The Patches Scrolls - Patches
3.2.2
Macgamefiles.com: World of Warcraft
The Patches Scrolls - Patches
3.2.2a
Macgamefiles.com: World of Warcraft
The Patches Scrolls - Patches
3.3.0
Macgamefiles.com: World of Warcraft
Games On Net File Library :: World of Warcraft - Patch 3.2.2.10505 to 3.3.0.10958 enUS OS X - WoW-3.2.2.10505-to-3.3.0.10958-enUS-patch.app.zip
The Patches Scrolls - Patches
3.3.0a
Macgamefiles.com: World of Warcraft
The Patches Scrolls - Patches
3.3.2
Macgamefiles.com: World of Warcraft
Games On Net File Library :: World of Warcraft Patch 3.3.0a to 3.3.2 - Mac USA/AUS - WoW-3.3.0.11159-to-3.3.2.11403-enUS-patch.app.zip
The Patches Scrolls - Patches
3.3.3
Macgamefiles.com: World of Warcraft
Games On Net File Library :: World of Warcraft: Client Patch v3.3.2 to v3.3.3 for Mac OS X - US/AU - WoW-3.3.2.11403-to-3.3.3.11685-enUS-patch.app.zip
The Patches Scrolls - Patches
3.3.3a
Macgamefiles.com: World of Warcraft
The Patches Scrolls - Patches
3.3.5
2shared - download WoW-3.3.3.11723-to-3.3.5.12213-enUS-patch.app
The Patches Scrolls - Patches (See notes if broken)
3.3.5a
2shared - download WoW-3.3.5.12213-to-3.3.5.12340-enUS-patch.app
The Patches Scrolls - Patches (See notes if broken)

set realmlist logon.warmane.com

1. Right/control click the patch file and select 'Show package contents'
1a. If you see the real patch file now, run that. Otherwise.
2. Go to /contents/MacOS/ and you should see a file called 'installer'
3. Open Terminal (/applications/utilities)
4. In terminal, type 'chmod 777 ' but do not enter (you must be on an administrator's account, also note space after the 777)
5. Drag the 'installer' file to terminal. The path of the file should be entered into terminal.
6. Press enter in terminal
7. Open the original patch file

Blizzard Updater was unable to read the file '/Applications/World of Warcraft/Data/enUS/backup-enUS.MPQ'. This error may be caused by problems with the media or drive at /--for example, a scratched or dirty CD-ROM/DVD-ROM..