A 64-bit client is once again available for use with Patch 4.3.4. Before being able to launch WoW in 64-bit mode you will need to download the 64-bit client for PC/Mac (using one of the links below), and unzip it into your World of Warcraft directory. Once you extract the files you can start the 64-bit client by opening the Launcher as normal (Run as Administrator if applicable). To switch back to the 32-bit client, go into Options -> Game Preferences, and check the Launch 32-bit client setting. The game will display which version you are using at the bottom left hand corner of the login screen. ex: Version 4.3.4 (15595) (Release x64)
Build 18.104.22.16895 - http://us.media.battle.net.edgesuite.net/downloads/wow-installers/live/WoWLive-64-Win-15595.zip" class="bml-link-url2">Windows</a> - http://us.media.battle.net.edgesuite.net/downloads/wow-installers/live/WoWLive-64-Mac-15595.zip" class="bml-link-url2">Mac</a>
**Important things to keep in mind**
Windows XP Professional “x64 Edition” / 64-bit Windows Vista / 64-bit Windows 7 (latest service packs).Mac OS 10.6.8 or newer. Mac Computer with Core 2 Duo or better2 GB or more of RAM.
If you encounter any issues while using the 64-bit version, please report your findings in this thread and return to using the 32-bit executable. In order to facilitate support when contacting Technical Support, please inform them if you are using the 64 bit client.
To remove the 64-bit client completely, delete the following files from your World of Warcraft folder:
World of Warcraft-64.app
How to tell if you have a 64-bit operating system:
Windows: <a href="http://support.microsoft.com/kb/827218/
Mac: <a href="http://support.apple.com/kb/HT4287