Just now, Apple has released the updated version of iTunes with version 10.5.2 which bring
iTunes Match improvements and fixes for audio distortion issues encountered with certain CDs.
Apple today also released the second beta version of iOS 5.1 along with the iTunes update and following is the official statement :-
iTunes 10.5.2 includes several improvements for iTunes Match and fixes an audio distortion problem when playing or importing certain CDs.
The last version of iTunes which brought along Match in USA was released in mid November and now after almost a month another version comes which in size is 102 MB for Mac , 66.13 MB for Windows (32 bit) and 68.01 MB for Windows (64 bit). Following are the links for download of the update version released today.
Download iTunes 10.5.2 Update for Windows and Mac
Download iTunes 10.5.2 Update for Windows (32 bit and 64 bit) [LINK]
Download iTunes 10.5.2 Update for Mac OS X [LINK]