Patch 5.4.2hotfix1 Edit
Patch 5.4.0hotfix1 is the unofficial name for the patch build 17688 that came out in the evening a little over a week after the official Patch 5.4.2 build 17658. Reliable info on this patch is scarce, but this client could correspond to the December 17, 2013 slate of hotfixes.
So far there in no official acknowledgement that a patch was released.
See also Edit