Blizzard has released new 64-bit clients for patch 4.3.3 today. Keep in mind that you need to remove the previous 64-bit client files before patching. After that's done, you can install these files:
Windows patch 4.3.3 64-bit client download link
Mac patch 4.3.3 64-bit client download link
February 28th 2012 at 3:00pm
While there are many of us enjoying the splendor that the 64-bit WoW client brings us, the upcoming patch 4.3.3 (which is likely to hit this week) will break this client. The 32-bit client will still work, however, and for the time being, everyone will need to use that.
We do not know how long i...
February 27th 2012 at 9:00am