In Chessbase 10, just click 'Help' in the menu, and then 'Get TWIC'.
Here is a Screen Shot:

Do you mean download the weekly digest file? If so, just click on the dowload link of your choice (text,pgn etc) at http://www.chess.co.uk/twic/twic.html then save it and unzip it when it's finished.
Twic download address recently is changed from www.chesscenter.com/twic/twic.html to www.theweekinchess.com/twic, so the 'Get TWIC' doesn't work anymore in CB 10. Is there any other solution except then downloading the twic manually?
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Hey can anyone tell me how i can update twic database?