How do you patch Warcraft 1.21 to 1.22

This is the page that official site of Blizzard Entertainment gives to its customers. There is everything you need to do:http://us.blizzard.com/support/article.xml?articleId=20673

The easiest way how to do it is to start the game and in the game menu pres BattleNet, to log on there you need the newest version, so the game will download and install it easily. The software will check what do you need and download all the patches that you have missed. That is the easiest way.

On this site you can download the patch on its own and install it by running it as a program. It will start the BNUpdate file in the game folder and the game will be patched. Here is the page: http://us.blizzard.com/support/article.xml?articleId=21220