Is there any special upgrade price (or will there be)for registered users of older version of CM. I have CM 9 version

Unlike older versions, CM 11 has no rebate (or upgrade price) for users of previous versions of Chessmaster.

You might be able to find a copy of Chessmaster 10 with a rebate sticker on the box; however, sometimes there is no upgrade sticker, meaning that the rebate has already been taken out of the price of the game.

The deal is:

You can find Chessmaster X for a very low budget price now! (I think it was about € 7 in Brussels)
(Check budget department in stores)

Chessmaster XI is only available as a full version.